a function to print a one-byte value as a binary number.

printByteAsBin.c

#include <stdio.h>

// a function to print a one-byte value as a binary number.
void printByteAsBin(unsigned char oneByte){
    unsigned char binStr[8];
    unsigned char mask = 128; // 0b 1000 0000;
    for(int i=0; i<8; i++){
        binStr[i] = (oneByte & mask) ? '1' : '0' ;
        mask >>= 1;
    }
    printf("%s\r\n", binStr);
}

int main(){
    unsigned char oneByte = 0b11110000;
    printByteAsBin(oneByte);
  
    return 0;
}