测试数据类型在32位系统下字节

#include <iostream>
using namespace std;
int main()
{
  cout << sizeof(char) << endl; 
  cout << sizeof(short) << endl; 
  cout << sizeof(unsigned) << endl; 
  cout << sizeof(int) << endl; 
  cout << sizeof(unsigned int) << endl; 
  cout << sizeof(long) << endl; 
  cout << sizeof(unsigned long) << endl; 
  cout << sizeof(float) << endl; 
  cout << sizeof(double) << endl; 
  cout << sizeof(void *) << endl;
}