64位整数的跨平台与印刷的printf [英] cross-platform printing of 64-bit integers with printf

问题描述

在Windows中，它是％I64d号。在Linux和Solaris，它是％LLD。结果
如果我想写打印长长值跨平台printfs输出。什么是这样做的好办法吗？

In Windows, it is "%I64d". In Linux and Solaris, it is "%lld".
If I want to write cross-platform printfs that print long long values. What is good way of doing so ?

    long long ll;
    printf(???, ll);

感谢

推荐答案

有几个方法。

您可以写在C99-符合时尚的code，然后提供系统特定的黑客编译的时候，作家让你失望。 （可悲的是，这是相当常见的C99。）

You could write your code in C99-conforming fashion, and then supply system-specific hacks when the compiler-writers let you down. (Sadly, that's rather common in C99.)

#include <stdint.h>
#include <inttypes.h>

printf("My value is %10" PRId64 "\n", some_64_bit_expression);

如果您的目标系统中的一个已经被忽视的实施＆LT; inttypes.h＆GT; 或者已经以其他方式恶魔般的懈怠，因为有些类型的特点是可选的，那么你只需要一个系统特定的的#define 为 PRId64 （或其他）在该系统上。

If one of your target systems has neglected to implement <inttypes.h> or has in some other way fiendishly slacked off because some of the type features are optional, then you just need a system-specific #define for PRId64 (or whatever) on that system.

另一种方法是捡东西，因此目前始终为64位的实现，是由printf的支持，再抹上。并不完美，但它通常会做的：

The other approach is to pick something that's currently always implemented as 64-bits and is supported by printf, and then cast. Not perfect but it will often do:

printf("My value is %10lld\n", (long long)some_64_bit_expression);

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