编译和运行

Question

我试着写、编译和运行我的第一个nimrod程序-- fizzbuzz。

Nimrod是从git和版本安装的。

[sayth nimrod]$  nimrod --version
Nimrod Compiler Version 0.9.4 (2014-04-28) [Linux: amd64]
Copyright (c) 2006-2014 by Andreas Rumpf

这是一个fizzbuzz

proc fizzBuzz(x, y: int) =
        for i in x .. y:
                if i mod 15 == 0:
                        echo("FizzBuzz")
                elif i mod 3 == 0:
                        echo("Fizz")
                elif i mod 5 == 0:
                        echo("Buzz")
                else:
                        echo(i)

我编译成c(有更好的选择吗？)我觉得没问题。

[sayth nimrod]$  nimrod c fizzbuzz.nim 
config/nimrod.cfg(37, 2) Hint: added path: '/home/sayth/.babel/pkgs/' [Path]
Hint: used config file '/home/sayth/Nimrod/config/nimrod.cfg' [Conf]
Hint: system [Processing]
Hint: fizzbuzz [Processing]
fizzbuzz.nim(1, 5) Hint: 'fizzbuzz.fizzBuzz(x: int, y: int)' is declared but not used [XDeclaredButNotUsed]
gcc -c  -w  -I/home/sayth/Nimrod/lib -o /home/sayth/Scripts/nimrod/nimcache/fizzbuzz.o /home/sayth/Scripts/nimrod/nimcache/fizzbuzz.c 
gcc -c  -w  -I/home/sayth/Nimrod/lib -o /home/sayth/Scripts/nimrod/nimcache/stdlib_system.o /home/sayth/Scripts/nimrod/nimcache/stdlib_system.c 
gcc   -o /home/sayth/Scripts/nimrod/fizzbuzz  /home/sayth/Scripts/nimrod/nimcache/stdlib_system.o /home/sayth/Scripts/nimrod/nimcache/fizzbuzz.o  -ldl
Hint: operation successful (8181 lines compiled; 1.065 sec total; 13.138MB) [SuccessX]

但是运行它不会产生输出。我做错什么了吗？

[sayth nimrod]$  ./fizzbuzz
[sayth nimrod]$ 

Answer 1

你只是忘了叫它。注意编译器提示：

fizzbuzz.nim(1, 5) Hint: 'fizzbuzz.fizzBuzz(x: int, y: int)' is declared but not used [XDeclaredButNotUsed]

不，您最好的选择是编译到C。将来可能会有一个LLVM后端，但是一般的看法是，它比它更麻烦。中间C输出更可移植(gcc运行在比LLVM更多的平台上)，您可以选择能够优化代码的编译器。