[开发工具]C++ 64位系统常见数据类型及大小 (Visual Studio & GCC x64)

1.用sizeof()运算符查看各数据类型大小

注意以下内部定义的别名：

unsigned short = unit16_t

unsigned int = uint32_t?

unsigned long (long) = uint64_t

#include<iostream>
#include<stdio.h>
using namespace std;

int main() {
	cout << "char : " << sizeof(char) << "字节" << endl;
	cout << "unsigned char : " << sizeof(uint8_t) << "字节" << endl;
	cout << "w_char : " << sizeof(wchar_t) << "字节" << endl;
	cout << "char16_t : " << sizeof(char16_t) << "字节" << endl;
	cout << "char32_t : " << sizeof(char32_t) << "字节" << endl;
	cout << "short : " << sizeof(short) << "字节" << endl;
	cout << "unsigned short : " << sizeof(uint16_t) << "字节" << endl;
	cout << "int : " << sizeof(int) << "字节" << endl;
	cout << "unsigned int : " << sizeof(uint32_t) << "字节" << endl;
	cout << "long : " << sizeof(long) << "字节" << endl;
	cout << "long long : " << sizeof(long long) << "字节" << endl;
	cout << "unsigned long (long) : " << sizeof(uint64_t) << "字节" << endl;
	cout << "float : " << sizeof(float) << "字节" << endl;
	cout << "double : " << sizeof(double) << "字节" << endl;
	cout << "long double : " << sizeof(long double) << "字节" << endl;
	return 0;
}

2.分别在VS 和 Linux 环境下运行代码并对比结果

?3.总结：

此外，32位系统的指针大小为4个字节，64位系统的指针大小为8个字节。

做笔记使用，如果有错误还请指正！！多谢！！！如果觉得总结的不错可以三连一手，嘻嘻~~