/**
 * Read bits from a number into a string 
 * The string is limited to 0 and 1
 * 
 * @author gtowell
 * Created: April 2021
 * **/

#include <stdio.h>
#include <stdlib.h>

/**
 * readbits from a char using normal math
 * @param xx -- the char to be read
 * @param rtn -- a stirng into which to write the bits
 * **/
void pbMATH(unsigned char xx, char rtn[]) {
    for (int i = 7; i >=0; i--)
    {
        rtn[i] = '0' + (xx % 2);
        //printf("bit num=%1d  value=%1d\n", i, xx % 2);
        xx /= 2;
    }
}

/**
 * readbits from a char using bit shifting
 * @param xx -- the char to be read
 * @param rtn -- a stirng into which to write the bits
 * **/
void pbBITS(unsigned char xx, char rtn[]) {
for (int i = 7; i >=0; i--)
    {
        rtn[i] = '0' + (xx&1);
        //printf("bit num=%1d  value=%1d\n", i, xx % 2);
        xx >>= 1;
    }
}

int main(int argc, char const *argv[])
{
    char aa[8];
    for (int i = 1; i < argc; i++)
    {
        pbMATH(atoi(argv[i]), aa);
        printf("BITS:%s\n", aa);
        pbBITS(atoi(argv[i]), aa);
        printf("BITS:%s\n", aa);
    }
    return 0;
}