C Programming · Question 14 · Hard

What will be the output of the following C program?

#include <stdio.h>

int f(int n) {
    if (n == 0)
        return 0;
    return (n % 2) + 10 * f(n / 2);
}

int main(void) {
    printf("%d", f(13));
    return 0;
}
  1. 1011
  2. 13
  3. 1101
  4. 6
Answer and explanation

Answer: C. 1101

Explanation: Each call keeps n % 2 as the last digit and shifts the result of f(n / 2) one decimal place left, so the function writes n in binary using decimal digits. 13 in binary is 1101.

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