Check whether an Integer has an Alternate Pattern Bit pattern or Not

#include <stdio.h>

int main(void) {
int num, x, y, count = 0;

    printf("enter the number:");
    scanf("%d", &num);
    x = num << 1;
    y = x ^ num;
    y = y + 1;
 
    y =  isPowerOfTwo(y);
 
    if(y)
        printf("true");
    else
        printf("false");
}

int isPowerOfTwo (unsigned int x)
{
       return ((x > 0) && ((x & (~x + 1)) == x));
}