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

// ansi escape codes for colors
#define GREEN "\033[32m"
#define RED "\033[31m"
#define RESET "\033[0m"

int main() {
    do {
        // allocate memory
        double a;
        double b;
        char op;

        printf(GREEN"Enter operator: "RESET);
        scanf(" %c", &op); // read character and ignore whitespace
        // read operands
        printf(GREEN"Enter operand 1: "RESET);
        scanf("%lf", &a);
        printf(GREEN"Enter operand 2: "RESET);
        scanf("%lf", &b);

        // result is by default not a number
        double res = NAN;
        
        switch (op)
        {
        case '+':
            res = a + b;
            break;
        case '-':
            res = a - b;
            break;
        case '*':
            res = a * b;
            break;
        case '/':
            res = a / b;
            break;
        
        default:
            printf(RED"invalid operation specified\n"RESET);
            break;
        }

        if (!isnan(res))
        {
            printf("\nTHE RESULT IS:\n");

            char buf[64] = {0};
            sprintf(buf, "figlet %lf | lolcat", res);
            system(buf);
        }

    } while(1);

    return 0;
}