3月23日 四

#include "stdafx.h"
#include <iostream>
using namespace std;
class A1
{
public:
	int a;
	static int b;
	A1();
	~A1();
};
class A2
{
public:
	int a;
	char c;
	A2();
	~A2();
};
class A3
{
public:
	float a;
	char c;
	A3();
	~A3();
};
class A4
{
public:
	float a;
	int b;
	char c;
	A4();
	~A4();
};
class A5
{
public:
	double d;
	float a;
	int b;
	char c;
	A5();
	~A5();
};

int _tmain(int argc, _TCHAR* argv[])
{
	int i;
	cout<<sizeof(A1)<<endl;
	cout<<sizeof(A2)<<endl;
	cout<<sizeof(A3)<<endl;
	cout<<sizeof(A4)<<endl;
	cout<<sizeof(A5)<<endl;
	cin>>i;
	return 0;
}

 输出为：4，8，8，12，24.原因：数据对齐。char要补齐。

short f();
cout<<sizeof(f());

 输出为2。根据代码调试猜测：函数的大小与返回值类型有关（未查证）。