mirror of
https://github.com/ziglang/zig.git
synced 2026-02-02 12:43:40 +00:00
6dba1f1c8e
* `@truncate` builtin allows casting to the same size integer. It also performs two's complement casting between signed and unsigned integers. * The idiomatic way to convert between bytes and numbers is now `mem.readInt` and `mem.writeInt` instead of an unsafe cast. It works at compile time, is safer, and looks cleaner. * Implicitly casting an array to a slice is allowed only if the slice is const. * Constant pointer values know if their memory is from a compile- time constant value or a compile-time variable. * Cast from [N]u8 to []T no longer allowed, but [N]u8 to []const T still allowed. * Fix inability to pass a mutable pointer to comptime variable at compile-time to a function and have the function modify the memory pointed to by the pointer. * Add the `comptime T: type` parameter back to mem.eql. Prevents accidentally creating instantiations for arrays.
40 lines
1.2 KiB
Zig
40 lines
1.2 KiB
Zig
const std = @import("std");
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const io = std.io;
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const Rand = std.rand.Rand;
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const os = std.os;
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pub fn main(args: [][]u8) -> %void {
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%%io.stdout.printf("Welcome to the Guess Number Game in Zig.\n");
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var seed_bytes: [@sizeOf(usize)]u8 = undefined;
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%%os.getRandomBytes(seed_bytes[0...]);
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const seed = std.mem.readInt(seed_bytes, usize, true);
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var rand: Rand = undefined;
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rand.init(seed);
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const answer = rand.rangeUnsigned(u8, 0, 100) + 1;
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while (true) {
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%%io.stdout.printf("\nGuess a number between 1 and 100: ");
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var line_buf : [20]u8 = undefined;
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const line_len = io.stdin.read(line_buf) %% |err| {
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%%io.stdout.printf("Unable to read from stdin: {}\n", @errorName(err));
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return err;
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};
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const guess = io.parseUnsigned(u8, line_buf[0...line_len - 1], 10) %% {
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%%io.stdout.printf("Invalid number.\n");
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continue;
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};
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if (guess > answer) {
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%%io.stdout.printf("Guess lower.\n");
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} else if (guess < answer) {
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%%io.stdout.printf("Guess higher.\n");
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} else {
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%%io.stdout.printf("You win!\n");
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return;
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}
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}
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}
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