#include <stdio.h>

int main() {
    char data = 0x21; //0010 0001 //char or int same
    int count;
    int i = 2;

    //while doing bellow copy tha data value for further use

    int cp = data;

    while(data!=0){//till 0000 0000
        i++;
        if(data & 1){ ///The value 1 in binary representation is 00000001.
            count++;
            printf("%d\n",i);
        }
        data = data >> 1;
    }
    /*  ex: 0001 0001
        Iteration 1: Current value of 'data': 0x21 (0001 0001)
        Iteration 2: Current value of 'data': 0x10 (0000 1000)
        Iteration 3: Current value of 'data': 0x08 (0000 0100)
        Iteration 4: Current value of 'data': 0x04 (0000 0010)
        Iteration 5: Current value of 'data': 0x02 (0000 0001)
    */

    printf("data = %d cp = %X\n", data, cp);

    printf("%d  %d",count, i);
}