C++中关于sizeof的值的汇总

一、x86编译器

1.操作系统内核信息

 2.测试代码

#include 
using namespace std;

int main(int argc,char** argv)
{
	cout << "sizeof(char) = " << sizeof(char) << endl;
	cout << "sizeof(short) = " << sizeof(short) << endl;
	cout << "sizeof(int) = " << sizeof(int) << endl;
	cout << "sizeof(long) = " << sizeof(long) << endl;
	cout << "sizeof(long long) = " << sizeof(long long) << endl;
	cout << "sizeof(float) = " << sizeof(float) << endl;
	cout << "sizeof(double) = " << sizeof(double) << endl << endl;

	cout << "sizeof(char*) = " << sizeof(char*) << endl;
	cout << "sizeof(short*) = " << sizeof(short*) << endl;
	cout << "sizeof(int*) = " << sizeof(int*) << endl;
	cout << "sizeof(long*) = " << sizeof(long*) << endl;
	cout << "sizeof(long long*) = " << sizeof(long long*) << endl;
	cout << "sizeof(float*) = " << sizeof(float*) << endl;
	cout << "sizeof(double*) = " << sizeof(double*) << endl << endl;

	char cmd;
	std::cin >> cmd;
	return 0;
}

3.运行结果

二、x64编译器

1.操作系统内核信息

 2.测试代码

#include 
using namespace std;

int main(int argc,char** argv)
{
	cout << "sizeof(char) = " << sizeof(char) << endl;
	cout << "sizeof(short) = " << sizeof(short) << endl;
	cout << "sizeof(int) = " << sizeof(int) << endl;
	cout << "sizeof(long) = " << sizeof(long) << endl;
	cout << "sizeof(long long) = " << sizeof(long long) << endl;
	cout << "sizeof(float) = " << sizeof(float) << endl;
	cout << "sizeof(double) = " << sizeof(double) << endl << endl;

	cout << "sizeof(char*) = " << sizeof(char*) << endl;
	cout << "sizeof(short*) = " << sizeof(short*) << endl;
	cout << "sizeof(int*) = " << sizeof(int*) << endl;
	cout << "sizeof(long*) = " << sizeof(long*) << endl;
	cout << "sizeof(long long*) = " << sizeof(long long*) << endl;
	cout << "sizeof(float*) = " << sizeof(float*) << endl;
	cout << "sizeof(double*) = " << sizeof(double*) << endl << endl;

	char cmd;
	std::cin >> cmd;
	return 0;
}

3.运行结果

三、测试结果分析

        对比分析x86和x64编译器环境下，除了sizeof(long) ，以及内存地址的长度不同，其他常用数据类型的长度是一样的。