Rust is a systems programming language that runs blazingly fast, prevents almost all crashes*, and eliminates data races.
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// This code is editable and runnable! fn main() { // A simple integer calculator: // `+` or `-` means add or subtract by 1 // `*` or `/` means multiply or divide by 2 let program = "+ + * - /"; let mut accumulator = 0; for token in program.chars() { match token { '+' => accumulator += 1, '-' => accumulator -= 1, '*' => accumulator *= 2, '/' => accumulator /= 2, _ => { /* ignore everything else */ } } } println!("The program \"{}\" calculates the value {}", program, accumulator); } 
// This code is editable and runnable!
fn main() {
// A simple integer calculator:
// `+` or `-` means add or subtract by 1
// `*` or `/` means multiply or divide by 2

let program = "+ + * - /";
let mut accumulator = 0;

for token in program.chars() {
match token {
    '+' => accumulator += 1,
    '-' => accumulator -= 1,
    '*' => accumulator *= 2,
    '/' => accumulator /= 2,
    _ => { /* ignore everything else */ }
}
}

println!("The program \"{}\" calculates the value {}",
   program, accumulator);
}
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* In theory. Rust is a work-in-progress and may do anything it likes up to and including eating your laundry.