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C Program to Count Number of bits set to 0 in an Integer

C Program to Count Number of bits set to 0 in an Integer

    #include <stdio.h>

    #define j_bits_int (8*sizeof(int))

    int count_unset(int);

    int main()

    {

        int i, j, sj, res, count = 0;

        printf("\nEnter the number");

        scanf("%d", &j);

        /*
         * Check each bit whether the bit is set or unset
         * Uses >> and & operator for checking individual bits
         */

        for (i = 0;i <= j_bits_int;i++)

        {

            sj = j >> i;

            res = sj & 1;

            if (res == 0)

                count++;

        }

        printf("%d", count);

    }

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