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

void disp(int n, char *msg){
    cout << '\t' << n << msg;
}

int main(int argc, char **argv){
    int num;
    if(argc>1)
	num = atoi(argv[1]);
    else{
	cout << "Enter a number, and I'll tell \nyou if it is even or odd:\n\t";
	cin >> num;
    }
    
    num%2 ? disp(num," is odd\n") : disp(num," is even\n");

    long double smp = 2;
    cout.precision(45);
    cout << "sqrt(2): " << sqrtl(smp) << endl;
    cout << "sqrt(2) * 5: " << sqrtl(smp)*5 << endl;
    cout << "7 / sqrt(2): " << 7/sqrtl(smp) << endl;

    return 0;
}