Bytes text representation with 0x00-0xff hexadecimal ASCII table

bytes-representatives.c

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

int main(void) {
    fprintf(stdout, ">> X0 X1 X2 X3 X4 X5 X6 X7 X8 X9 XA XB XC XD XE XF\n");
    for(int i = 0; i < 16; ++i) {
        fprintf(stdout, "%XX", i);
        for(int j = 0; j < 16; ++j) {
            unsigned char num = i * 16 + j;
            
            if(num < 0x20)
                fprintf(stdout, " ..");
            else
                fprintf(stdout, "  %c", num);
        }
        fprintf(stdout, "\n");
    }
    fprintf(stdout, "--------------------------------------------------\n");
    fprintf(stdout, "OEM DISPLAY 256 CHARS ::: BYTES TEXT REPRESENTATES\n");
    
    return 0;
}