Control Flow

For Loops

Summing a Range

A for loop walks each value of a range or collection. Each pass can update accumulated state.

Program

Play the program to add the numbers 1 through 3.

loops.rs 
fn main() {
    let mut total = 0;
    for n in 1..=3 {
        total += n;
    }
    println!("{total}");
}
for `for n in 1..=3` repeats once per value.
inclusive range `1..=3` includes both endpoints.
compound assignment `total += n` adds into the accumulator.