C Programming — MCQ Practice Questions & Answers

Question 1

What is the output of this program? for (int i = 1; i <= 3; i++) for (int j = 1; j <= 2; j++) printf("%d", i*j); printf("
");

Accepted Answer

Correct answer: A. 1 2
 2 4
 3 6 — Nested loops: outer i=1,2,3; inner j=1,2. Prints products: 1*1=1, 1*2=2 (newline), 2*1=2, 2*2=4 (newline), etc.

Answer

B. 12 24 36

Answer

C. 123456

Answer

D. Error

Question 2

What is the output of this complex nested control flow? int x = 1, y = 2; if (x < y) { x++; y--; if (x == y) printf("Equal"); else printf("NotEqual"); }

Accepted Answer

Correct answer: A. Equal — x=1, y=2. Since 1 < 2, x becomes 2 and y becomes 1. Now x != y, but after operations x=2, y=1. Wait: x++ makes x=2, y-- makes y=1. So x==y is false, printing 'NotEqual'. Rechecking: 1 < 2 is true, so enter if. x becomes 2, y becomes 1. 2 == 1 is false, so else executes, printing 'NotEqual'.

Answer

B. NotEqual

Answer

C. No output

Answer

D. Compilation error

Question 3

What happens when continue is used in a for loop with a post-increment expression?

Accepted Answer

Correct answer: B. The increment still executes — When continue is executed in a for loop, the post-increment (i++) still executes before the condition is checked again. Only the body statements after continue are skipped.

Answer

A. The increment is skipped

Answer

C. Loop terminates

Answer

D. Infinite loop occurs

Question 4

What is the effect of using multiple break statements in nested loops?

Accepted Answer

Correct answer: C. Each break terminates its corresponding loop level — Each break statement exits only its immediately enclosing loop. To exit multiple nested loops, you need one break for each level you want to exit.

Answer

A. All nested loops terminate at once

Answer

B. Only the innermost loop terminates

Answer

D. Compilation error occurs

Question 5

What is the output of this complex nested loop? for(int i = 1; i <= 2; i++) { for(int j = 1; j <= 2; j++) { if(i == j) continue; printf("%d%d ", i, j); } }

Accepted Answer

Correct answer: B. 12 21 — continue skips when i==j. i=1: prints 12 (skips 11); i=2: prints 21 (skips 22). Output: 12 21

Answer

A. 11 12 21 22

Answer

C. 11 22

Answer

D. 12 21 22

Question 6

What is the output of: for(int i = 0; i < 2; i++) for(int j = 0; j < 2; j++) if(i == j) continue; printf("Done");

Accepted Answer

Correct answer: A. Done — continue skips current iteration but doesn't affect outer loop. After nested loops complete, 'Done' prints once.

Answer

B. Nothing printed

Answer

C. DoneDoneDone (three times)

Answer

D. Compilation error

Question 7

What will this code do? int i = 0; while(i < 5) { printf("%d ", i++); if(i == 3) break; }

Accepted Answer

Correct answer: A. Prints: 0 1 2 — Post-increment: prints 0 (i becomes 1), prints 1 (i becomes 2), prints 2 (i becomes 3). When i==3, break executes. Output: 0 1 2

Answer

B. Prints: 0 1 2 3

Answer

C. Prints: 1 2 3

Answer

D. Infinite loop

Question 8

Which statement best describes the 'dangling else' problem in C?

Accepted Answer

Correct answer: B. Else binds to the nearest preceding if without an else — Dangling else refers to ambiguity when else could bind to multiple if statements. C resolves this by binding else to the nearest if.

Answer

A. else cannot be used with nested if statements

Answer

C. Multiple else statements cause compilation error

Answer

D. Else keyword must be on same line as if

C Programming - MCQ Practice Questions