Program to swap two numbers using functions.

			#include<stdio.h>
			#include<conio.h>
			void main()
			{
			void swap(int,int);
			int a,b,r;
			clrscr();
			printf("enter value for a&b: ");
			scanf("%d%d",&a,&b);
			swap(a,b);
			getch();
			}

			
			void swap(int a,int b)
			{
			int temp;
			temp=a;
			a=b;
			b=temp;
			printf("after swapping the value for a & b is : %d %d",a,b);
			}
Output:
enter value for a&b: 4
5
after swapping the value for a & b : 5 4