c++ 三个数大小的比较

#include <iostream.h> 
void swap(int &e,int &f) 
{ 
int temp; 
temp=e; 
e=f; 
f=temp; 
} 
void intSort(int &a, int &b, int &c) 
{ 
int temp; 
if (a<b) 
{ 
swap(a,b); 
} 
if (a<c) 
{ 
swap(a,c); 
} 
if (b<c) 
{ 
swap(b,c); 
} 
} 
int main() 
{ 
int a=4,b=13,c=12;
intSort(a,b,c); 
cout <<a<<","<<b<<","<<c<<endl; 
return 0;