#include <iostream>
#include <cstdlib>
#include <cmath>
using namespace std;

void usage() {
    // Prints usage message (help)
    system("figlet XSC | lolcat");
    cout << "\neXtremelySimpleCalculator usage:\n"
    << "`xsc --help` for help\n"
    << "`xsc <number> <(+|-|*|/|%|^)> <number>` for basic operation calculating\n"
    << "`xsc -r|--sqrt <number>` for square root calculation\n";
}

int main(int argc, char* argv[]) {
    if (argv[1] == "--help" || argv[1] == "-h") {
        usage();
        return 0;
    }
    else {
        if (argv[2][0] == '+') { cout << atof(argv[1]) + atof(argv[3]); }
        else if (argv[2][0] == '-') { cout << atof(argv[1]) - atof(argv[3]); }
        else if (argv[2][0] == '*') { cout << atof(argv[1]) * atof(argv[3]); }
        else if (argv[2][0] == '/') { cout << atof(argv[1]) / atof(argv[3]); }
        else if (argv[2][0] == '%') { cout << fmod(atof(argv[1]), atof(argv[3])); }
        else if (argv[2][0] == '^') { cout << pow(atof(argv[1]), atof(argv[3]));  }

        // Let's not SIGSEGV here for god's sake (a.k.a. square rooting my lif)
        else if (argv[1] == "-r" || argv[1] == "--sqrt") {
            if (argv[2] != NULL) {
                cout << sqrt(atof(argv[2])); 
            }
            else {
                cout << "[!] error: missing argument for sqrt operation\n";
                cout << "debugInfo: argv[2] = " << argv[2] << "\n";
            }
        }
    }
    return 0;
}