nittc-procon advent calendar 2020

nobug.zig

const std = @import("std");

fn read_num(comptime T: type, stdin: *const std.fs.File) T {
    var buf: [64]u8 = undefined;
    const len = stdin.read(&buf) catch |err| {
        std.debug.warn("Error while reading number: {}\n", .{err});
        std.os.exit(1);
    };
    if (len == buf.len) {
        std.debug.warn("Input is too big!\n", .{});
        std.os.exit(1);
    }
    const line = std.mem.trimRight(u8, buf[0..len], "\r\n");
    const val = std.fmt.parseInt(T, line, 10) catch |err| {
        std.debug.warn("Error while parsing number: {}\n", .{err});
        std.os.exit(1);
    };
    return val;
}

pub fn main() anyerror!void {
    const stdin = std.io.getStdIn();
    var v: u16 = undefined;
    const data: usize = 80;

    std.debug.warn("please input number: ", .{});
    v = read_num(u16, &stdin);
    std.debug.warn("v: {}, data: {}\n", .{ v, data });
}