Quiz: C Control Flow

5 questionsNo time limitPass: 60%+10 XP on first pass

Decisions and loops in C with clear examples: if-else ladders, switch with fall-through, the three loops, break and continue, nested loops and pattern programs.

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Question 1

What does this print?

#include <stdio.h>
int main(void) {
    int x = 2;
    switch (x) {
        case 1: printf("A");
        case 2: printf("B");
        case 3: printf("C");
        default: printf("D");
    }
    return 0;
}

BBCBCDABCD

Question 2

What does this print?

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

01234450

Question 3

What does this print?

#include <stdio.h>
int main(void) {
    int x = 0;
    if (x = 0) printf("yes");
    else printf("no");
    return 0;
}

yesnoCompile error0

Question 4
Which loop always runs its body at least once?
forwhiledo-whilenone

Question 5

What does this print?

#include <stdio.h>
int main(void) {
    int count = 0;
    for (int i = 1; i <= 20; i++) {
        if (i % 3 == 0) count++;
    }
    printf("%d", count);
    return 0;
}

76520