assignment-p-08.c

Metadata

• Author — Amit Dutta (amitdutta4255@gmail.com)
• Last updated — 12 Dec 2025
• License — MIT

Problem Statement

Problem Statement

Write a C program that includes a user-defined function named countSetBits with the signature int countSetBits(int num);. The function should count and return the number of set bits (1s) in the binary representation of the given number.

Source Code

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#include <stdio.h>

int countSetBits(int);

int main()
{
    int num, result;
    printf("Enter the number: ");
    scanf("%d", &num);
    if (result = countSetBits(num))
    {
        printf("\nNumber of set bits in %d: %d", num, result);
    }
    else
    {
        printf("\nThere is no set bits in %d", num);
    }
    return 0;
}

int countSetBits(int num)
{
    int count = 0;
    int mask= 1;
	int i = 1;
    while (i <= 16)
    {
        if (num & mask)
        {
            count++;
        }
        mask <<= 1;
        i++;
    }
    return count;
}