Swap的比较

#include <iostream.h>
void swap1(int   a,int   b)
{ int c=a;    a=b; b=c;}
void swap2(int * a,int * b)
{ int * c=a;    a=b; b=c;}
void swap3(int * a,int * b)
{ int c=*a;    *a=*b; *b=c;}
void swap4(int & a,int & b)
{ int c=a;    a=b; b=c;}




void main()
{ int x,y,z;


x=11;y=88;
swap1(x,y);
cout<<"swap1:x="<<x<<"  y="<<y<<endl; //swap1:x=11 y=88


x=11;y=88;
swap2(&x,&y);
cout<<"swap2:x="<<x<<"  y="<<y<<endl; //swap2:x=11 y=88


x=11;y=88;
swap3(&x,&y);
cout<<"swap3:x="<<x<<"  y="<<y<<endl; //swap3:x=88 y=11


x=11;y=88;
swap4(x,y);
cout<<"swap4:x="<<x<<"  y="<<y<<endl; //swap4:x=88 y=11




}