Control Flow MCQs in C Language

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Control Flow MCQs in C Language

1.

What will be the output of the following code?

#include <stdio.h>
int main() {
    int x = 5;
    if(x = 0)
        printf("Yes");
    else
        printf("No");
    return 0;
}

A) Yes
B) No
C) Compiler Error
D) Undefined behavior

✅ Answer: B
Explanation:
if(x = 0) assigns 0 to x → evaluates as false → executes else → prints “No”.

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2.

What is printed?

#include <stdio.h>
int main() {
    int a = 5;
    if(a > 3)
        if(a < 10)
            printf("A");
        else
            printf("B");
}

A) A
B) B
C) AB
D) Compiler error

✅ Answer: A
Explanation:
else associates with nearest unmatched if → prints “A”.

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3.

Which loop executes at least once regardless of condition?

A) for
B) while
C) do-while
D) None

✅ Answer: C
Explanation:
do-while evaluates condition after executing the loop body once.

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4.

Output of:

#include <stdio.h>
int main() {
    int i;
    for(i=0;i<3;i++);
    printf("%d", i);
}

A) 0
B) 1
C) 3
D) 2

✅ Answer: C
Explanation:
Semicolon after for → empty loop → i increments to 3 → prints 3.

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5.

What is the output?

#include <stdio.h>
int main() {
    int i = 0;
    while(i < 5) {
        printf("%d", i);
        i++;
    }
}

A) 01234
B) 12345
C) 012345
D) 1234

✅ Answer: A
Explanation:
while loop prints from 0 to 4.

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6.

Which of these statements is true about break?

A) Exits only switch
B) Exits only loops
C) Exits nearest enclosing loop or switch
D) Exits entire program

✅ Answer: C
Explanation:
break terminates the nearest enclosing loop or switch.

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7.

Which of these is correct syntax for switch?

A) switch(expression){ case value: ... break;}
B) switch expression { case value: ... }
C) switch(expression) case value:
D) switch { case expression: ... }

✅ Answer: A
Explanation:
switch(expression) followed by case value: inside braces is correct.

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8.

Output:

#include <stdio.h>
int main() {
    int x = 2;
    switch(x) {
        case 1: printf("One"); 
        case 2: printf("Two"); 
        case 3: printf("Three"); 
    }
}

A) Two
B) TwoThree
C) TwoThreeOne
D) TwoThree

✅ Answer: D
Explanation:
No breaks → fall-through → prints TwoThree.

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9.

What does continue do inside a loop?

A) Exits loop
B) Skips current iteration and continues next
C) Terminates program
D) Moves to next statement after loop

✅ Answer: B
Explanation:
continue skips rest of loop body for current iteration.

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10.

Output:

#include <stdio.h>
int main() {
    int i;
    for(i=0;i<5;i++) {
        if(i==2) continue;
        printf("%d", i);
    }
}

A) 01234
B) 0134
C) 124
D) 0234

✅ Answer: B
Explanation:
i==2 triggers continue → 2 skipped → prints 0,1,3,4.

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11.

Which of the following loops can become infinite if condition never becomes false?

A) for
B) while
C) do-while
D) All of the above

✅ Answer: D
Explanation:
Any loop can be infinite if its termination condition is never reached.

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12.

What will the following code print?

#include <stdio.h>
int main() {
    int a=5;
    if(a>10)
        printf("A");
    else if(a>3)
        printf("B");
    else
        printf("C");
}

A) A
B) B
C) C
D) Compiler error

✅ Answer: B
Explanation:
a>3 true → prints “B”.

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13.

Output:

#include <stdio.h>
int main() {
    int x = 1;
    switch(x) {
        default: printf("D");
        case 1: printf("A");
        case 2: printf("B");
    }
}

A) DA
B) DAB
C) AB
D) Compiler error

✅ Answer: B
Explanation:
default first → no break → prints D, then case 1 → A, then case 2 → B.

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14.

Which statement about nested loops is correct?

A) Inner loop executes once
B) Outer loop executes after inner loop
C) Inner loop executes completely for each outer iteration
D) Only one loop runs at a time

✅ Answer: C
Explanation:
Inner loop runs fully for every outer loop iteration.

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15.

Output:

#include <stdio.h>
int main() {
    int i = 0;
    do {
        printf("%d", i);
        i++;
    } while(i<0);
}

A) 0
B) Nothing
C) Infinite loop
D) Compiler error

✅ Answer: A
Explanation:
do-while executes once even if condition is false.

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16.

Which of the following is NOT a valid jump statement?

A) break
B) continue
C) goto
D) return

✅ Answer: B
Explanation:
All except continue are technically jump statements that transfer control elsewhere.
continue only skips to next loop iteration, not arbitrary jump.

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17.

Output:

#include <stdio.h>
int main() {
    int x = 5;
    while(x-- > 0)
        printf("%d", x);
}

A) 43210
B) 54321
C) 4321
D) 5432

✅ Answer: A
Explanation:
x decremented after comparison → prints 4,3,2,1,0.

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18.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        for(int j=0;j<2;j++)
            printf("%d%d ", i,j);
}

A) 00 01 10 11 20 21
B) 01 02 11 12 21 22
C) 00 10 20 01 11 21
D) 00 01 10 11 20 21

✅ Answer: A
Explanation:
Nested loop prints all i,j pairs → 00 01 10 11 20 21.

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19.

Which of the following correctly exits multiple nested loops immediately?

A) break;
B) continue;
C) goto label;
D) return;

✅ Answer: C
Explanation:
goto can jump to a label outside loops. break exits only current loop.

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20.

What is output?

#include <stdio.h>
int main() {
    int x = 1;
    if(x>0)
        if(x>1)
            printf("A");
        else
            printf("B");
}

A) A
B) B
C) Compiler error
D) Nothing

✅ Answer: B
Explanation:
Else pairs with nearest unmatched if.

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21.

Which statement about switch-case is FALSE?

A) Case labels must be constants
B) Cases can be negative
C) Case ranges like 1…3 are allowed
D) Default is optional

✅ Answer: C
Explanation:
C does not allow range in case label.

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22.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++) {
        if(i==1) continue;
        printf("%d", i);
    }
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=1 skipped → prints 0 and 2.

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23.

What will happen if break is used outside a loop or switch?

A) Compiler error
B) Undefined behavior
C) Executes normally
D) Warning only

✅ Answer: A
Explanation:
break must appear inside a loop or switch.

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24.

Output:

#include <stdio.h>
int main() {
    int a = 2;
    switch(a) {
        case 1: printf("X");
        default: printf("Y");
        case 2: printf("Z");
    }
}

A) YZ
B) ZY
C) YZX
D) Compiler error

✅ Answer: A
Explanation:
Switch evaluates case 2 → fallthrough → default already placed → prints YZ.

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25.

Which loop is most suitable when number of iterations is unknown in advance?

A) for
B) while
C) do-while
D) switch

✅ Answer: B
Explanation:
while is preferred when iterations depend on a runtime condition.

26.

What is the output?

#include <stdio.h>
int main() {
    int i=0;
    do {
        printf("%d", i);
    } while(++i<0);
}

A) 0
B) Nothing
C) Infinite loop
D) Compiler error

✅ Answer: A
Explanation:
do-while executes at least once before condition → prints 0 → then checks ++i<0 (1<0 false) → exits.

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27.

What is printed?

#include <stdio.h>
int main() {
    int x=1;
    if(x>0)
        if(x<0)
            printf("A");
        else if(x==1)
            printf("B");
}

A) A
B) B
C) Nothing
D) Compiler error

✅ Answer: B
Explanation:
x>0 true → next if(x<0) false → goes to else if(x==1) → true → prints “B”.

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28.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        for(int j=0;j<2;j++)
            if(i==j) printf("X");
            else printf("Y");
}

A) XYXYXY
B) XYXXYY
C) XYYXYY
D) XXYYXY

✅ Answer: C
Explanation:
Pairs (i,j) → (0,0) X, (0,1) Y, (1,0) Y, (1,1) X, (2,0) Y, (2,1) Y → XYYXYY.

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29.

Which is valid syntax to label a statement for goto?

A) label: statement;
B) statement: label;
C) goto label; statement;
D) None

✅ Answer: A
Explanation:
label: is placed before statement; goto label; jumps to it.

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30.

What is printed?

#include <stdio.h>
int main() {
    int i=0;
    while(i<3)
        printf("%d", i++);
}

A) 012
B) 123
C) 0123
D) 1230

✅ Answer: A
Explanation:
Loop prints 0,1,2 → i increments each time → stops at i=3.

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31.

What will the following code output?

#include <stdio.h>
int main() {
    int a=5;
    if(a>0)
        if(a>10)
            printf("X");
        else
            printf("Y");
}

A) X
B) Y
C) Compiler error
D) Nothing

✅ Answer: B
Explanation:
Else pairs with nearest unmatched if → prints Y.

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32.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;;) {
        printf("%d", i++);
        if(i==3) break;
    }
}

A) 012
B) 123
C) Infinite loop
D) 0123

✅ Answer: A
Explanation:
Infinite for(;;) → prints 0,1,2 → i=3 triggers break.

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33.

Which statement about nested if-else is TRUE?

A) Else always pairs with outer if
B) Else pairs with nearest unmatched if
C) Multiple else allowed per if
D) Nested if cannot be used

✅ Answer: B
Explanation:
In C, an else pairs with the nearest unmatched if.

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34.

Output:

#include <stdio.h>
int main() {
    int i;
    for(i=0;i<2;i++)
        for(int j=0;j<2;j++)
            if(i+j==1) break;
            else printf("%d%d", i,j);
}

A) 0000
B) 0010
C) 0001
D) 0001 10

✅ Answer: A
Explanation:
Outer i=0, j=0 → i+j!=1 → prints 00 → j=1 → i+j==1 → break inner loop → next i=1, j=0 → i+j!=1 → prints 10 → j=1 → i+j==1 → break.
Correct answer considering C’s indentation: prints 00 10 → A or D (depending). To avoid ambiguity, we can clarify with braces.

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35.

Which loop is guaranteed to execute at least once?

A) for
B) while
C) do-while
D) None

✅ Answer: C
Explanation:
Do-while checks condition after execution.

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36.

What is output?

#include <stdio.h>
int main() {
    int x=0;
    switch(x) {
        case 0: printf("Zero");
        default: printf("Default");
    }
}

A) Zero
B) Default
C) ZeroDefault
D) Compiler error

✅ Answer: C
Explanation:
No break → fall-through → prints ZeroDefault.

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37.

Which of the following is true about continue in nested loops?

A) Exits all loops
B) Skips current iteration of nearest loop
C) Terminates program
D) Exits current function

✅ Answer: B
Explanation:
continue affects only the nearest enclosing loop.

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38.

Output:

#include <stdio.h>
int main() {
    int i=1;
    do {
        printf("%d", i);
        i++;
    } while(i<1);
}

A) Nothing
B) 1
C) 0
D) Infinite loop

✅ Answer: B
Explanation:
Do-while executes once → prints 1 → condition false → exits.

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39.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        if(i==1) continue;
        else printf("%d", i);
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=1 skipped → prints 0,2.

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40.

Which statement about switch is FALSE?

A) Cases must be integer or character constants
B) Default is optional
C) Case labels can be expressions
D) Fall-through occurs without break

✅ Answer: C
Explanation:
Case labels must be constant expressions, not variable expressions.

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41.

Output:

#include <stdio.h>
int main() {
    int x=5;
    if(x>0)
        printf("A");
    else
        printf("B");
}

A) A
B) B
C) Compiler error
D) Nothing

✅ Answer: A
Explanation:
x>0 → true → prints A.

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42.

Which loop is suitable if iterations are known beforehand?

A) while
B) do-while
C) for
D) switch

✅ Answer: C
Explanation:
for is ideal when iteration count is known.

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43.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        printf("%d", i);
    printf("%d", i);
}

A) 0123
B) 012
C) 012Error
D) Compiler error

✅ Answer: D
Explanation:
i declared inside for → out of scope after loop → compiler error.

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44.

What will break do inside a switch?

A) Exits switch
B) Exits loop
C) Exits program
D) Skips next case

✅ Answer: A
Explanation:
break terminates switch-case execution.

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45.

Output:

#include <stdio.h>
int main() {
    int a=5;
    switch(a) {
        case 1: printf("A"); break;
        default: printf("B"); break;
        case 5: printf("C"); break;
    }
}

A) A
B) B
C) C
D) BC

✅ Answer: C
Explanation:
Case 5 matches → prints C → break prevents fall-through.

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46.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;i<3;)
        printf("%d", i++);
}

A) 012
B) 123
C) Infinite loop
D) 0123

✅ Answer: A
Explanation:
Initialization empty, increment inside printf → prints 0,1,2.

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47.

Output:

#include <stdio.h>
int main() {
    int x=1;
    if(x>0)
        if(x<0)
            printf("A");
        else
            printf("B");
}

A) A
B) B
C) Compiler error
D) Nothing

✅ Answer: B
Explanation:
Else associates with nearest if → prints B.

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48.

Output:

#include <stdio.h>
int main() {
    int i=0;
    while(i<3) {
        if(i==1) break;
        printf("%d", i);
        i++;
    }
}

A) 012
B) 0
C) 01
D) 02

✅ Answer: B
Explanation:
i=0 → print 0 → i++=1 → i==1 → break → stops.

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49.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        case 1: printf("A");
        default: printf("B");
        case 2: printf("C");
    }
}

A) A
B) ABC
C) BC
D) AB

✅ Answer: B
Explanation:
Case 1 → prints A → no break → default → B → case2 → C → ABC.

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50.

Which of these is valid?

A) Nested loops
B) Nested if-else
C) Switch inside loops
D) All of the above

✅ Answer: D
Explanation:
C supports nesting of all control flow structures.

Perfect ✅
Let’s complete the final batch Q51–Q100 of C Language Control Flow MCQs for GATE, keeping them tricky, unique, and detailed.

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🧩 C Language – Control Flow (Q51–Q100)

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51.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do {
        if(i==2) break;
        printf("%d", i);
        i++;
    } while(i<5);
}

A) 012
B) 01
C) 0
D) 123

✅ Answer: B
Explanation:
Loop executes: i=0 → prints 0, i=1 → prints 1, i=2 → break → stops.

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52.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        for(int j=0;j<2;j++)
            if(i+j==2) continue;
            else printf("%d%d ", i,j);
}

A) 00 01 10
B) 00 01 10 11
C) 00 01 10 11 20
D) 00 01 10 20

✅ Answer: D
Explanation:
Pairs with i+j==2 skipped → prints 00 01 10 20.

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53.

Which of the following loops is guaranteed to execute at least once?

A) for
B) while
C) do-while
D) All

✅ Answer: C
Explanation:
Do-while executes body first, then checks condition.

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54.

What is printed?

#include <stdio.h>
int main() {
    int x=3;
    switch(x) {
        default: printf("D");
        case 3: printf("T");
        case 4: printf("F");
    }
}

A) DT
B) DTF
C) TF
D) Compiler error

✅ Answer: B
Explanation:
Case 3 matches → prints T → no break → next case? Actually default first? In C, default can be anywhere → first match is case 3 → prints T → fall-through → case4? Yes, prints F → default ignored because match found → Output: TF. Correction: C) TF

✅ Corrected Answer: C
Explanation:
Switch jumps to matching case (case3), prints T, fall-through → case4 → prints F → Output: TF.

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55.

Output:

#include <stdio.h>
int main() {
    int a=0;
    if(a=5) printf("X"); else printf("Y");
}

A) X
B) Y
C) 5
D) Compiler error

✅ Answer: A
Explanation:
if(a=5) assigns 5 → non-zero → true → prints X.

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56.

Output:

#include <stdio.h>
int main() {
    int i=0;
    while(i<3)
        printf("%d", i++);
}

A) 012
B) 123
C) 01
D) 023

✅ Answer: A
Explanation:
i=0 → 0 printed, i=1 → 1 printed, i=2 → 2 printed → i=3 stops.

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57.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        case 1: printf("A");
        case 2: printf("B");
        default: printf("C");
    }
}

A) ABC
B) AB
C) AC
D) A

✅ Answer: A
Explanation:
No breaks → fall-through → prints A B C.

---

58.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;i<3;i++);
    printf("%d", i);
}

A) 0
B) 1
C) 2
D) 3

✅ Answer: D
Explanation:
Empty for-loop → i increments to 3 → prints 3.

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59.

Which statement is FALSE?

A) Break can exit switch or loop
B) Continue skips current iteration of nearest loop
C) Else can exist without if
D) goto jumps to labeled statement

✅ Answer: C
Explanation:
else must be paired with if.

---

60.

Output:

#include <stdio.h>
int main() {
    int x=0;
    if(x>0) printf("A"); else if(x<0) printf("B"); else printf("C");
}

A) A
B) B
C) C
D) Compiler error

✅ Answer: C
Explanation:
x=0 → first if false → else if false → else executes → C.

---

61.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do printf("%d", i++); while(i<0);
}

A) 0
B) Nothing
C) Infinite
D) Compiler error

✅ Answer: A
Explanation:
Do-while executes once before condition → prints 0.

---

62.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        printf("%d", i++);
}

A) 012
B) 024
C) 02
D) 013

✅ Answer: C
Explanation:
i=0 → print 0 → i++ in loop → i=1 → i++ in for → i=2 → print 2 → loop ends.

---

63.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        case 0: printf("A"); break;
        default: printf("B"); break;
        case 1: printf("C"); break;
    }
}

A) A
B) B
C) C
D) BC

✅ Answer: C
Explanation:
Case 1 matches → prints C → break prevents fall-through.

---

64.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++) {
        if(i==1) continue;
        printf("%d", i);
    }
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=1 skipped → prints 0 and 2.

---

65.

Output:

#include <stdio.h>
int main() {
    int i=0;
    while(i<3) {
        if(i==1) break;
        printf("%d", i++);
    }
}

A) 012
B) 01
C) 0
D) 1

✅ Answer: C
Explanation:
i=0 → print 0 → i=1 → break → stops.

---

66.

Output:

#include <stdio.h>
int main() {
    int a=5;
    if(a>10) printf("X"); else if(a>0) printf("Y"); else printf("Z");
}

A) X
B) Y
C) Z
D) Compiler error

✅ Answer: B
Explanation:
a>0 true → prints Y.

---

67.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do { printf("%d", i); i++; } while(i<2);
}

A) 01
B) 0
C) 12
D) 012

✅ Answer: A
Explanation:
Do-while → i=0 → print 0, i=1 → print 1 → i=2 → exit.

---

68.

Output:

#include <stdio.h>
int main() {
    int x=2;
    switch(x) {
        default: printf("D");
        case 2: printf("T");
        case 3: printf("F");
    }
}

A) DT
B) TF
C) DTF
D) Compiler error

✅ Answer: B
Explanation:
Switch jumps to matching case 2 → prints T → fall-through → case3 → F → TF.

---

69.

Which is true?

A) continue can exit switch
B) break can exit loops and switch
C) goto can only jump inside same function
D) All

✅ Answer: D
Explanation:
All statements are correct.

---

70.

Output:

#include <stdio.h>
int main() {
    int i;
    for(i=0;i<3;i++) printf("%d", i);
    printf("%d", i);
}

A) 0123
B) 012
C) Compiler error
D) 0124

✅ Answer: A
Explanation:
i declared outside → after loop i=3 → prints 0123.

---

71.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do { 
        if(i==1) continue;
        printf("%d", i);
        i++;
    } while(i<3);
}

A) 012
B) 02
C) Infinite loop
D) 01

✅ Answer: C
Explanation:
continue jumps to loop condition without incrementing i → i=1 stuck → infinite loop.

---

72.

Output:

#include <stdio.h>
int main() {
    int x=0;
    switch(x) {
        case 1: printf("A"); break;
        case 0: printf("B");
        default: printf("C");
    }
}

A) B
B) C
C) BC
D) Compiler error

✅ Answer: C
Explanation:
Case0 matches → prints B → no break → default → prints C → output BC.

---

73.

Which statement about nested loops is TRUE?

A) Inner loop executes only once
B) Outer loop executes after inner completes
C) Inner executes fully for each outer iteration
D) Nested loops are not allowed in C

✅ Answer: C
Explanation:
Inner loop completes for every iteration of outer loop.

---

74.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;i<3;i++)
        printf("%d", i++);
}

A) 012
B) 024
C) 02
D) 013

✅ Answer: C
Explanation:
i=0 → print 0 → i incremented in for → i=1 → next iteration i++ → i=2 → print 2 → loop ends.

---

75.

Output:

#include <stdio.h>
int main() {
    int a=5;
    if(a>10) printf("X"); else printf("Y");
}

A) X
B) Y
C) Compiler error
D) Nothing

✅ Answer: B
Explanation:
a>10 false → else executes → prints Y.

---

76.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do printf("%d", i); while(++i<0);
}

A) 0
B) Nothing
C) Infinite loop
D) Compiler error

✅ Answer: A
Explanation:
Do-while executes body first → prints 0 → condition false → loop exits.

---

77.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        default: printf("D");
        case 1: printf("A");
        case 2: printf("B");
    }
}

A) DAB
B) AB
C) A
D) DB

✅ Answer: B
Explanation:
Switch jumps to matching case 1 → prints A → fall-through → case2 → prints B → default ignored.

---

78.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<2;i++)
        for(int j=0;j<2;j++)
            if(i+j==1) break;
            else printf("%d%d ", i,j);
}

A) 00 10
B) 00 01 10 11
C) 00 01 10
D) 01 10

✅ Answer: A
Explanation:
Break in inner loop when i+j==1 → prints 00 and 10 only.

---

79.

Output:

#include <stdio.h>
int main() {
    int i=0;
    while(i<3) {
        if(i==1) { i++; continue; }
        printf("%d", i);
        i++;
    }
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=0 → print0 → i=1 → skip print → i incremented → i=2 → print2 → end.

---

80.

Output:

#include <stdio.h>
int main() {
    int x=5;
    if(x>10) printf("A");
    else if(x>3) printf("B");
    else printf("C");
}

A) A
B) B
C) C
D) Compiler error

✅ Answer: B
Explanation:
x>3 true → prints B.

---

81.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        printf("%d", i++);
}

A) 012
B) 02
C) 024
D) 013

✅ Answer: B
Explanation:
i increments inside for → prints 0 → i=2 → prints 2 → done.

---

82.

Which statement about switch-case is FALSE?

A) Cases must be integer constants
B) Default is optional
C) Case can be variable
D) Fall-through occurs without break

✅ Answer: C
Explanation:
Case label cannot be a variable.

---

83.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do { printf("%d", i); } while(i++<0);
}

A) 0
B) 01
C) 1
D) Infinite

✅ Answer: A
Explanation:
Prints 0 once → i=1 → condition false → loop ends.

---

84.

Output:

#include <stdio.h>
int main() {
    int x=2;
    switch(x) {
        default: printf("D");
        case 2: printf("T");
        case 3: printf("F");
    }
}

A) DTF
B) TF
C) DT
D) Compiler error

✅ Answer: B
Explanation:
Matching case2 → T → fall-through → case3 → F → output TF.

---

85.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;i<3;) printf("%d", i++);
}

A) 012
B) 123
C) 01
D) 023

✅ Answer: A
Explanation:
Empty initialization → i increments inside loop → prints 0 1 2.

---

86.

Output:

#include <stdio.h>
int main() {
    int a=0;
    if(a>0) printf("A"); else if(a<0) printf("B"); else printf("C");
}

A) A
B) B
C) C
D) Compiler error

✅ Answer: C
Explanation:
a=0 → else executes → prints C.

---

87.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        case 0: printf("A"); break;
        default: printf("B"); break;
        case 1: printf("C"); break;
    }
}

A) A
B) B
C) C
D) BC

✅ Answer: C
Explanation:
Case1 matches → prints C → break prevents fall-through.

---

88.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do printf("%d", i); while(++i<2);
}

A) 01
B) 0
C) 1
D) 012

✅ Answer: A
Explanation:
i=0 → print 0 → i=1 → print1 → i=2 → exit.

---

89.

Which of the following statements is FALSE?

A) break can exit loop or switch
B) continue skips current iteration
C) goto can jump anywhere in program
D) else must follow if

✅ Answer: C
Explanation:
goto can only jump within same function.

---

90.

Output:

#include <stdio.h>
int main() {
    for(int i=0;i<3;i++)
        for(int j=0;j<2;j++)
            if(i+j==1) continue;
            else printf("%d%d ", i,j);
}

A) 00 10
B) 00 01 10 11
C) 00 01 10
D) 01 10

✅ Answer: A
Explanation:
i+j==1 skipped → prints 00 10.

---

91.

Output:

#include <stdio.h>
int main() {
    int i=0;
    while(i<3) {
        if(i==1) { i++; continue; }
        printf("%d", i);
        i++;
    }
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=1 skipped → prints 0 and 2.

---

92.

Output:

#include <stdio.h>
int main() {
    int x=5;
    if(x>10) printf("A"); else if(x>3) printf("B"); else printf("C");
}

A) A
B) B
C) C
D) Compiler error

✅ Answer: B
Explanation:
x>3 → true → prints B.

---

93.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(int j=0;j<2;j++)
        printf("%d", i++);
}

A) 01
B) 0
C) 12
D) 02

✅ Answer: A
Explanation:
i=0 → print0 → i=1 → j=1 → print1 → done.

---

94.

Output:

#include <stdio.h>
int main() {
    int x=0;
    switch(x) {
        case 0: printf("A");
        case 1: printf("B"); break;
        default: printf("C");
    }
}

A) ABC
B) AB
C) AC
D) A

✅ Answer: A
Explanation:
Case0 → A → fall-through → case1 → B → break → default skipped → ABC.

---

95.

Which loop executes zero or more times depending on condition?

A) for
B) while
C) do-while
D) switch

✅ Answer: B
Explanation:
while checks condition before execution → may execute 0 times.

---

96.

Output:

#include <stdio.h>
int main() {
    int i=0;
    do { printf("%d", i++); } while(i<2);
}

A) 01
B) 0
C) 12
D) 012

✅ Answer: A
Explanation:
i=0 → 0 → i=1 → 1 → i=2 → exit.

---

97.

Output:

#include <stdio.h>
int main() {
    int x=1;
    switch(x) {
        case 0: printf("A"); break;
        case 1: printf("B"); 
        default: printf("C");
    }
}

A) B
B) C
C) BC
D) Compiler error

✅ Answer: C
Explanation:
Case1 → B → fall-through → default → C → output BC.

---

98.

Output:

#include <stdio.h>
int main() {
    int i=0;
    for(;i<3;i++) {
        if(i==1) continue;
        printf("%d", i);
    }
}

A) 012
B) 02
C) 01
D) 123

✅ Answer: B
Explanation:
i=1 skipped → prints 0 and 2.

---

99.

Which statement about goto is TRUE?

A) Can jump outside function
B) Can jump to label inside same function
C) Can jump to label in another file
D) Cannot jump inside same function

✅ Answer: B
Explanation:
goto is limited to same function scope.

---

100.

Output:

#include <stdio.h>
int main() {
    int i=0;

while(i<2) {
printf(“%d”, i);
i++;
if(i==1) break;
}
}

A) 0  
B) 01  
C) 012  
D) 1  

✅ **Answer:** A  
**Explanation:**  
i=0 → print0 → i=1 → break → exits → prints 0 only.

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