b883bc873d
* add `@bswap` builtin function. See #767 * comptime evaluation facilities are improved to be able to handle a `@ptrCast` with a backing array. * `@truncate` allows "truncating" a u0 value to any integer type, and the result is always comptime known to be `0`. * when specifying pointer alignment in a type expression, the alignment value of pointers which do not have addresses at runtime is ignored, and always has the default/ABI alignment * threw in a fix to freebsd/x86_64.zig to update syntax from language changes * some improvements are pending #863 closes #638 closes #1733 std lib API changes * io.InStream().readIntNe renamed to readIntNative * io.InStream().readIntLe renamed to readIntLittle * io.InStream().readIntBe renamed to readIntBig * introduced io.InStream().readIntForeign * io.InStream().readInt has parameter order changed * io.InStream().readVarInt has parameter order changed * io.InStream().writeIntNe renamed to writeIntNative * introduced io.InStream().writeIntForeign * io.InStream().writeIntLe renamed to writeIntLittle * io.InStream().writeIntBe renamed to writeIntBig * io.InStream().writeInt has parameter order changed * mem.readInt has different parameters and semantics * introduced mem.readIntNative * introduced mem.readIntForeign * mem.readIntBE renamed to mem.readIntBig and different API * mem.readIntLE renamed to mem.readIntLittle and different API * introduced mem.readIntSliceNative * introduced mem.readIntSliceForeign * introduced mem.readIntSliceLittle * introduced mem.readIntSliceBig * introduced mem.readIntSlice * mem.writeInt has different parameters and semantics * introduced mem.writeIntNative * introduced mem.writeIntForeign * mem.writeIntBE renamed to mem.readIntBig and different semantics * mem.writeIntLE renamed to mem.readIntLittle and different semantics * introduced mem.writeIntSliceForeign * introduced mem.writeIntSliceNative * introduced mem.writeIntSliceBig * introduced mem.writeIntSliceLittle * introduced mem.writeIntSlice * removed mem.endianSwapIfLe * removed mem.endianSwapIfBe * removed mem.endianSwapIf * added mem.littleToNative * added mem.bigToNative * added mem.toNative * added mem.nativeTo * added mem.nativeToLittle * added mem.nativeToBig
49 lines
1.4 KiB
Zig
49 lines
1.4 KiB
Zig
const builtin = @import("builtin");
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const std = @import("std");
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const io = std.io;
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const fmt = std.fmt;
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const os = std.os;
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pub fn main() !void {
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var stdout_file = try io.getStdOut();
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const stdout = &stdout_file.outStream().stream;
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try stdout.print("Welcome to the Guess Number Game in Zig.\n");
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var seed_bytes: [@sizeOf(u64)]u8 = undefined;
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os.getRandomBytes(seed_bytes[0..]) catch |err| {
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std.debug.warn("unable to seed random number generator: {}", err);
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return err;
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};
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const seed = std.mem.readIntNative(u64, &seed_bytes);
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var prng = std.rand.DefaultPrng.init(seed);
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const answer = prng.random.range(u8, 0, 100) + 1;
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while (true) {
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try stdout.print("\nGuess a number between 1 and 100: ");
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var line_buf: [20]u8 = undefined;
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const line = io.readLineSlice(line_buf[0..]) catch |err| switch (err) {
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error.OutOfMemory => {
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try stdout.print("Input too long.\n");
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continue;
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},
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else => return err,
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};
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const guess = fmt.parseUnsigned(u8, line, 10) catch {
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try stdout.print("Invalid number.\n");
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continue;
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};
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if (guess > answer) {
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try stdout.print("Guess lower.\n");
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} else if (guess < answer) {
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try stdout.print("Guess higher.\n");
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} else {
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try stdout.print("You win!\n");
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return;
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}
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}
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}
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