mathquiz.rs

use std::io;
use rand::Rng;

const SETS :usize = 8;

fn mathquiz()
{
    let mut var = [[0u32; 4]; SETS];
    let mut tally = 0;

    for i in 0..SETS
    {
        let mut input = String::new();
        var[i][0] = rand::rng().random_range(0..99);
        var[i][1] = rand::rng().random_range(0..99);
        var[i][2] = var[i][0] + var[i][1];
        println!("{} + {} = ", var[i][0], var[i][1]);
        let _ = io::stdin().read_line(&mut input);
        var[i][3] = input.trim().parse().expect("you didn't enter a number!");
        if var[i][2] == var[i][3]
        {
            println!("correct!");
            tally += 1;
        }
        else
        {
            println!("you entered {}, the correct answer is {}", var[i][3], var[i][2]);
        }
    }

    println!("Out of {} questions, you answered {} correctly!", SETS, tally);
}

fn main()
{
    mathquiz();
}