帮我做个初级题目

//C语言版本
#include <stdio.h>
int main()
{
int a=5;
int b=8;
int c=0;
printf("a=%d,b=%d",a,b);
c=a;
a=b;
b=c;
printf("a=%d,b=%d",a,b);
getch();
}

//java版本
public class Demo{
public static void main(String args[]){
int a=5;
int b=8;
int c=0;
System.out.printf("a=%d,b=%d",a,b);
c=a;
a=b;
b=c;
System.out.printf("a=%d,b=%d",a,b);

}
}

#include<iostream>
using namespace std;
int main()
void fun(int&,int&);
{
int a=5,b=8;
cout<<"before change:";
cout<<"a="<<a<<",b="<<b;
fun(a,b)
cout<<"after change;";
ciut<<"a="<<a<<",b=&