C++中的int和short int

 #include <iostream>
 #include <string>
 #include <cstring>  //strcpy
 #include <cstdlib>  //malloc
 #include <cstdio>  //printf

 using namespace std; 

 int main(){

     cout<<sizeof(int)<<endl;
     cout<<sizeof(short int)<<endl;
     cout<<sizeof(unsigned int)<<endl;
     cout<<sizeof(unsigned short int)<<endl;

     return ;
 }

在64位的Fedora下（编译器为G++）运行结果为：

4
2
4
2