ミニプロジェクト: FizzBuzz

ここでは小さな実践として FizzBuzz を実装します。
複数条件の分岐を if 式で積み上げる練習です。

FizzBuzz の核となる関数

TESTstdionormalize_newlines

#entry main
#indent 4
#target std

#import "core/math" as *
#import "std/stdio" as *
#import "alloc/string" as *

fn show_line <(i32)*>()> (n):
    print_i32 n;
    print " -> ";
    println <str> if:
        cond eq mod_s n 15 0
        then "FizzBuzz"
        else:
            if:
                cond eq mod_s n 3 0
                then "Fizz"
                else:
                    if:
                        cond eq mod_s n 5 0
                        then "Buzz"
                        else from_i32 n

fn main <()*> ()> ():
    show_line 6;
    show_line 10;
    show_line 30;
    show_line 7

標準出力に結果を表示する

TESTstdionormalize_newlines

#entry main
#indent 4
#target std

#import "core/math" as *
#import "std/stdio" as *
#import "alloc/string" as *

fn print_fizzbuzz_1_to_n <(i32)*>()> (n):
    let mut i <i32> 1;
    while le i n:
        do:
            println <str> if:
                cond eq mod_s i 15 0
                then "FizzBuzz"
                else:
                    if:
                        cond eq mod_s i 3 0
                        then "Fizz"
                        else:
                            if:
                                cond eq mod_s i 5 0
                                then "Buzz"
                                else from_i32 i
            set i add i 1;

fn main <()*> ()> ():
    print_fizzbuzz_1_to_n 15