1 #include <iostream> 2 void swapr(int& a,int& b); 3 void swapp(int* p,int* q); 4 void swapv(int a,int b); 5  6 using namespace std; 7  8 int main() 9 {10     int value1=100,value2=200;11     cout<<"value1:"<<value1<<" value2:"<<value2<<endl;12     cout<<"refence swap:"<<endl;13     swapr(value1,value2);14     cout<<"value1:"<<value1<<" value2:"<<value2<<endl;15     cout<<"point swap:"<<endl;16     swapp(&value1,&value2);17     cout<<"value1:"<<value1<<" value2:"<<value2<<endl;18     cout<<"value swap :"<<endl;19     swapv(value1,value2);20     cout<<"value1:"<<value1<<" value2:"<<value2<<endl;21     return 0;22 }23 void swapr(int& a,int& b)24 {25     int temp;26     temp=a;27     a=b;28     b=temp;29 }30 void swapp(int* p,int* q)31 {32     int temp;33     temp=*p;34     *p=*q;35     *q=temp;36 }37 void swapv(int a,int b)38 {39     int temp;40     temp=a;41     a=b;42     b=temp;43 }