Swap : Call by reference in C

#include<stdio.h>
int swap(int*,int*);
void main()
{
	int a,b;
	printf("Enter a:\t");
	scanf("%d",&a);
	printf("Enter b:\t");
	scanf("%d",&b);
	printf("Entered value of\n'a' is:%d \n 'b' is: %d",a,b);
	swap(&a,&b);
	printf("value after swaping ....\n a=%d\n b=%d",a,b);
	
}
int swap(int*a,int*b)
{
	int temp;
	temp=*a;
	*a=*b;
	*b=temp;
}