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Programming in C MCQ - Find the Output

36 Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int i = 1, sum = 0;
while (i <= 10) {
    sum += i * 2;
    if (sum >= 30)
        break;
    i += 2;
}
printf("%d %d", i, sum);

The sum progresses 2, 8, 18, 32. At i=7, the threshold is reached and the loop breaks.

37 Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int x = 100, count = 0;
while ((x = x / 3) > 2)
    count += x % 2;
printf("%d %d", x, count);

x takes values 33, 11, 3, then 1. The first three values are odd and contribute 1 each; the final value stops the loop.

38 Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int a = 1, b = 20;
while (a < b) {
    a = a * 2 + 1;
    b -= 3;
}
printf("%d %d", a, b);

The pairs become (3,17), (7,14), and (15,11), at which point the condition is false.

39 Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int i = 1, j, sum = 0;
while (i <= 4) {
    j = 1;
    while (j <= 4) {
        if (i * j > 6)
            break;
        sum++;
        j++;
    }
    i++;
}
printf("%d", sum);

The inner loop completes 4, 3, 2, and 1 successful iterations, giving 10.

40 Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int n = 73142, sum = 0, position = 1;
while (n > 0) {
    int digit = n % 10;
    if (position % 2 == 0)
        sum += digit;
    else
        sum -= digit;
    position++;
    n /= 10;
}
printf("%d", sum);

Reading digits from right to left produces -2+4-1+3-7 = -3.

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Question:

Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):int i, j, sum = 0; for (i = 1;…

A. 24
B. 30
C. 32
D. 40

Correct answer: C

Explanation:

Only odd i+j pairs contribute: 6 for i=1, 8 for i=2, and 18 for i=3, totaling 32.

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Question

Find the output of the following C code (assume #include <stdio.h> and that the code is inside int main(void)):

int i, j, sum = 0;
for (i = 1; i <= 3; i++) {
    for (j = 1; j <= 4; j++) {
        if ((i + j) % 2 == 0)
            continue;
        sum += i * j;
    }
}
printf("%d", sum);

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