mirror of
https://codeberg.org/andyscott/ziglings.git
synced 2024-11-12 13:00:47 -05:00
94 lines
2.5 KiB
Zig
94 lines
2.5 KiB
Zig
//
|
|
// Help! Evil alien creatures have hidden eggs all over the Earth
|
|
// and they're starting to hatch!
|
|
//
|
|
// Before you jump into battle, you'll need to know four things:
|
|
//
|
|
// 1. You can attach functions to structs:
|
|
//
|
|
// const Foo = struct{
|
|
// pub fn hello() void {
|
|
// std.debug.print("Foo says hello!\n", .{});
|
|
// }
|
|
// }
|
|
//
|
|
// 2. A function that is a member of a struct is a "method" and is
|
|
// called with the "dot syntax" like so:
|
|
//
|
|
// Foo.hello();
|
|
//
|
|
// 3. The NEAT feature of methods is the special parameter named
|
|
// "self" that takes an instance of that type of struct:
|
|
//
|
|
// const Bar = struct{
|
|
// number: u32,
|
|
//
|
|
// pub fn printMe(self: *Bar) void {
|
|
// std.debug.print("{}\n", .{self.number});
|
|
// }
|
|
// }
|
|
//
|
|
// 4. Now when you call the method on an INSTANCE of that struct
|
|
// with the "dot syntax", the instance will be automatically
|
|
// passed as the "self" parameter:
|
|
//
|
|
// var my_bar = Bar{ .number = 2000 };
|
|
// my_bar.printMe(); // prints "2000"
|
|
//
|
|
// Okay, you're armed.
|
|
//
|
|
// Now, please zap the alien structs until they're all gone or
|
|
// Earth will be doomed!
|
|
//
|
|
const std = @import("std");
|
|
|
|
// Look at this hideous Alien struct. Know your enemy!
|
|
const Alien = struct {
|
|
health: u8,
|
|
|
|
// We hate this method:
|
|
pub fn hatch(strength: u8) Alien {
|
|
return Alien{
|
|
.health = strength * 5,
|
|
};
|
|
}
|
|
|
|
// We love this method:
|
|
pub fn zap(self: *Alien, damage: u8) void {
|
|
self.health -= if (damage >= self.health) self.health else damage;
|
|
}
|
|
};
|
|
|
|
pub fn main() void {
|
|
// Look at all of these aliens of various strengths!
|
|
var aliens = [_]Alien{
|
|
Alien.hatch(2),
|
|
Alien.hatch(1),
|
|
Alien.hatch(3),
|
|
Alien.hatch(3),
|
|
Alien.hatch(5),
|
|
Alien.hatch(3),
|
|
};
|
|
|
|
var aliens_alive = aliens.len;
|
|
var heat_ray_strength: u8 = 7; // We've been given a heat ray weapon.
|
|
|
|
// We'll keep checking to see if we've killed all the aliens yet.
|
|
while (aliens_alive > 0) {
|
|
aliens_alive = 0;
|
|
|
|
// Loop through every alien...
|
|
for (aliens) |*alien| {
|
|
|
|
// *** Zap the Alien Here! ***
|
|
???.zap(heat_ray_strength);
|
|
|
|
// If the alien's health is still above 0, it's still alive.
|
|
if (alien.health > 0) aliens_alive += 1;
|
|
}
|
|
|
|
std.debug.print("{} aliens. ", .{aliens_alive});
|
|
}
|
|
|
|
std.debug.print("Earth is saved!\n", .{});
|
|
}
|