Zig by Example: While

To repeat an expression in Zig, while loops can be used.

 
const std = @import("std");
const print = std.debug.print;
 
pub fn main() anyerror!void {

The body of a while loop will repeatedly execute until the while loop’s condition is no longer true.

 
    var i: usize = 0;
    while (i < 2) {
        print("i: {}\n", .{i});
        i += 1;
    }

While loops support continue expressions, which are evaluated each time the loop’s body is executed.

 
    var j: usize = 0;
    while (j < 2) : (j += 1) {
        print("j: {}\n", .{j});
    }

To break out of a while loop, use the break keyword.

 
    while (true) {
        break;
    }

To jump to the next iteration of a while loop, use the continue keyword.

 
    var k: usize = 0;
    while (true) : (k += 1) {
        if (k < 2) {
            print("k: {}\n", .{k});
            continue;
        }
 
        break;
    }
}
 
$ zig run while.zig
i: 0
i: 1
j: 0
j: 1
k: 0
k: 1

Next example: For.

by Jason Phan | source | license