programming-examples/c/Bitwise/C Program to Check if All the Bits of a given Integer is One(1).c

/*
 * C Program to check if all the bits of a given integer is one(1)
 */
#include <stdio.h>

int all_bits_one(int);
int count = 0;

void main()
{
    int num;
    printf("enter the number:");
    scanf("%d", &num);
    num++;
    all_bits_one(num);
    if (count)
        {
            printf("false");
        }
    else
        {
            printf("true");
        }
}

/* checks whether all bits are 1 */
int all_bits_one(int x)
{
    if (x == 1)
        return 0;
    if (x % 2 != 0)
        {
            count++;
        }
    else
        {
            x = x / 2;
            all_bits_one(x);
        }
}