paint.c

/* 
 * Compile with
 * gcc -Wall -o paint paint.c
 *
 * Run with
 * ./paint $(tput lines) $(tput cols)
 */

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

char rand_char() {
    return ' ' + rand() % 27;
}

int rand_fg_color() {
    return 30 + rand() % 8;
}

int rand_bg_color() {
    return 40 + rand() % 8;
}

int main(int argc, char **argv) {
    if (argc != 3) {
        printf("Usage: %s rows cols\n", argv[0]);
        return 1;
    }

    int rows = atoi(argv[1]);
    int cols = atoi(argv[2]);

    srand(time(NULL));

    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            printf("\033[%d;%dm%c\033[0m", rand_fg_color(), rand_bg_color(), rand_char());
        }
        printf("\n");
    }

    return 0;
}