#include <stdio.h>
#include <limits.h>

// Convert a char to a binary string representation of that char value

char* chartobin ( unsigned char c )
{
    static char bin[CHAR_BIT + 1] = { 0 };
    int i;

    for ( i = CHAR_BIT - 1; i >= 0; i-- )
    {
        bin[i] = (c % 2) + '0';
        c /= 2;
    }

    return bin;
}

Convert a char to a binary string representation

C++