ansii_colors.c

/*
    How to print color text in terminal (Linux terminals, Putty, etc.)

    "\e[31mI am red\e[0m" <- prints text in red
*/

#include <stdio.h>
#include <math.h>

const char* const ANSI_RED    = "\033[31m";
const char* const ANSI_GREEN  = "\033[32m";
const char* const ANSI_YELLOW = "\033[33m";
const char* const ANSI_RESET  = "\033[0m";

int main() {

    int test_freqs[] = { 0, 1000, 4499, 4500, 4999, 5000, 5001, 5500, 5501, 7000, -1};
    const int freq = 5000;
    const int margin = 500;

    printf("Setup:\n\texpected frequency = %s%d%s\n\tmargin             = %s%d%s\n\n",
        ANSI_GREEN, freq, ANSI_RESET,
        ANSI_GREEN, margin, ANSI_RESET);

    int iter = 0;
    const char* color = 0;
    while (test_freqs[iter] != -1) {
        if (test_freqs[iter] == freq)
            color = ANSI_YELLOW;
        else if (abs(test_freqs[iter] - freq) > margin)
            color = ANSI_RED;
        else
            color = ANSI_GREEN;

        printf("frequency = %s%d%s\n", color, test_freqs[iter++], ANSI_RESET);
    }

    return 0;
}