use std::env;
use std::process;
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() != 4 {
eprintln!("Usage: {} <number1> <operator> <number2>", args[0]);
eprintln!("Operators: +, -, *, /");
eprintln!("Example: {} 5 + 3", args[0]);
process::exit(1);
}
let num1: f64 = match args[1].parse() {
Ok(n) => n,
Err(_) => {
eprintln!("Error: '{}' is not a valid number", args[1]);
process::exit(1);
}
};
let operator = &args[2];
let num2: f64 = match args[3].parse() {
Ok(n) => n,
Err(_) => {
eprintln!("Error: '{}' is not a valid number", args[3]);
process::exit(1);
}
};
let result = match operator.as_str() {
"+" => num1 + num2,
"-" => num1 - num2,
"*" => num1 * num2,
"/" => {
if num2 == 0.0 {
eprintln!("Error: Division by zero!");
process::exit(1);
}
num1 / num2
}
_ => {
eprintln!("Error: Unknown operator '{}'", operator);
eprintln!("Supported operators: +, -, *, /");
process::exit(1);
}
};
println!("{} {} {} = {}", num1, operator, num2, result);
}
