如何在 C 中用逗号格式化货币? [英] How can I format currency with commas in C?

问题描述

我正在寻找将 Long Float 格式化为 C 中的货币.我想在开头放置一个美元符号，逗号迭代小数点前的第三个数字，并在小数点前一个点.到目前为止，我一直在打印这样的数字:

I'm looking to format a Long Float as currency in C. I would like to place a dollar sign at the beginning, commas iterating every third digit before decimal, and a dot immediately before decimal. So far, I have been printing numbers like so:

printf("你欠你 $%.2Lf! ", 钱);

printf("You are owed $%.2Lf! ", money);

返回类似的东西

欠你 123456789.00 美元！

数字应该看起来像这样

$123,456,789.00
$1,234.56
$123.45

任何答案都不需要在实际代码中.你不必用勺子喂食.如果有与 c 相关的细节会有所帮助，请提及.其他伪代码就好了.

Any answers need not be in actual code. You don't have to spoon feed. If there are c-related specifics which would be of help, please mention. Else pseudo-code is fine.

谢谢.

推荐答案

您的 printf 可能已经能够通过 ' 标志自行完成.不过，您可能需要设置您的语言环境.这是我机器上的一个例子:

Your printf might already be able to do that by itself with the ' flag. You probably need to set your locale, though. Here's an example from my machine:

#include <stdio.h>
#include <locale.h>

int main(void)
{
    setlocale(LC_NUMERIC, "");
    printf("$%'.2Lf
", 123456789.00L);
    printf("$%'.2Lf
", 1234.56L);
    printf("$%'.2Lf
", 123.45L);
    return 0;
}

并运行它:

> make example
clang -Wall -Wextra -Werror    example.c   -o example
> ./example 
$123,456,789.00
$1,234.56
$123.45

这个程序在我的 Mac (10.6.8) 和我刚刚尝试过的 Linux 机器 (Ubuntu 10.10) 上都能按照你想要的方式运行.

This program works the way you want it to both on my Mac (10.6.8) and on a Linux machine (Ubuntu 10.10) I just tried.

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