中的int64_t定义 [英] Definition of int64_t

问题描述

我是新来的C / C ++，所以我有一对夫妇约一个基本类型的问题：

a）您能向我解释的int64_t 和长（长之间的的区别INT ）？
在我的理解，都是64位整数。是否有任何理由要选择一个比其他？

二）我试图查找中的int64_t 在网络上的定义，但没有成功。有权威人士透露我需要这样的问题需要咨询？

c）对于code。使用的int64_t 来编译，我目前包括＆LT; iostream的＆GT; ，这没有多大意义，我。是否还有其他包括提供的声明的int64_t ？

解决方案


  

a）您能向我解释的int64_t 和长（长之间的的区别INT ）？在我的理解，都是64位整数。是否有任何理由要选择一个比其他？

前者是一个符号整型用的究竟的64位。后者是一个符号整型用的至少的32位。

  

二）我试图查找中的int64_t 在网络上的定义，但没有成功。有权威人士透露我需要这样的问题需要咨询？

HTTP：//cp$p$pference.com 这里涵盖这样的：<一href=\"http://en.cp$p$pference.com/w/cpp/types/integer\">http://en.cp$p$pference.com/w/cpp/types/integer.该权威人士透露，然而，这是<一个href=\"http://stackoverflow.com/questions/81656/where-do-i-find-the-current-c-or-c-standard-documents\">C++标准（此特定位可在§18.4整数类型中找到[cstdint]）。

  

c）对于code。使用的int64_t 来编译，我包括＆LT; iostream的＆GT; ，其中没有多大意义了我。是否还有其他包括提供的声明的int64_t ？

这是＆LT宣布; cstdint＆GT; 或＆LT; cinttypes＆GT; （下命名空间 STD ）或＆LT; stdint.h＆GT; 或＆LT; inttypes.h＆GT; （全局命名空间）。

I am new to C/C++, so I have a couple of questions about a basic type:

a) Can you explain to me the difference between int64_t and long (long int)? In my understanding, both are 64 bit integers. Is there any reason to choose one over the other?

b) I tried to look up the definition of int64_t on the web, without much success. Is there an authoritative source I need to consult for such questions?

c) For code using int64_t to compile, I am currently including <iostream>, which doesn't make much sense to me. Are there other includes that provide a declaration of int64_t?

解决方案

a) Can you explain to me the difference between int64_t and long (long int)? In my understanding, both are 64 bit integers. Is there any reason to choose one over the other?

The former is a signed integer type with exactly 64 bits. The latter is a signed integer type with at least 32 bits.

b) I tried to look up the definition of int64_t on the web, without much success. Is there an authoritative source I need to consult for such questions?

http://cppreference.com covers this here: http://en.cppreference.com/w/cpp/types/integer. The authoritative source, however, is the C++ standard (this particular bit can be found in §18.4 Integer types [cstdint]).

c) For code using int64_t to compile, I am including <iostream>, which doesn't make much sense to me. Are there other includes that provide a declaration of int64_t?

It is declared in <cstdint> or <cinttypes> (under namespace std), or in <stdint.h> or <inttypes.h> (in the global namespace).

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