我应该如何打印类型，如off_t和为size_t？ [英] How should I print types like off_t and size_t?

问题描述

我试图打印类型，如 off_t 和为size_t 。什么是的printf正确的占位符（）的就是便携的？

I'm trying to print types like off_t and size_t. What is the correct placeholder for printf() that is portable?

或者是有一个完全不同的方式来打印这些变量？

Or is there a completely different way to print those variables?

推荐答案

您可以使用以Z 用于为size_t和 T 为ptrdiff_t的像

You can use z for size_t and t for ptrdiff_t like in

printf("%zu %zd", size, ptrdiff);

但我的联机帮助说一些老图书馆采用了不同性格比以Z 和鼓励使用它。尽管如此，它的标准化（由C99标准）。对于那些还会将intmax_t 和中int8_t stdint.h 的等对，还有你可以使用宏，像另一个回答说：

But my manpage says some older library used a different character than z and discourages use of it. Nevertheless, it's standardized (by the C99 standard). For those intmax_t and int8_t of stdint.h and so on, there are macros you can use, like another answer said:

printf("value: %" PRId32, some_int32_t);
printf("value: %" PRIu16, some_uint16_t);

他们是在的手册页所列inttypes.h 。

就个人而言，我只想投的价值观无符号长或长像另一个答案建议。如果你使用的C99，那么你可以（而且应该，当然）转换为无符号长长或长长和使用％LLU 或％LLD 分别格式。

Personally, I would just cast the values to unsigned long or long like another answer recommends. If you use C99, then you can (and should, of course) cast to unsigned long long or long long and use the %llu or %lld formats respectively.

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