How do you write a function swap?

you can use follwing code:
#include<stdio.h>
#include<conio.h>
void swap(int *a,int *b)
{
int temp;
temp=*a;
*a=*b;
*b=temp;
printf("a=%d b=%d",*a,*b);
}
void main()
{
int a=5,b=8;
swap(&a,&b);
}

Well, Swetha's method is proper, but only meant for integers.
Following is the swap function for any type like: int, char, structure, pointers etc. anything.

template<class T>
void swap(T &data1, T &data2)
{
T temp = data1;
data1 = data2;
data2 = temp;
}