cgoffredo77

// simple calculator app in Rust

use std::io::{stdin, stdout, Write};

// create a function
fn read(input: &mut String) {
	stdout().flush().expect("failed to flush");
	stdin().read_line(input).expect("failed to read");
}
fn main() {

cgoffredo77

/*
   simple rust calculator

   add_op := '+' | '-'
   mul_op := '*' | '/'
   digits := {'+' | '-'} [0..9] {[0..9]}
   
   expr := term {add_op term}
   term := factor {mul_op factor}
   factor := digits | '(' expr ')'