C Program To Swap Two Integers Using Pointer

C Program :

/* Aim: To swap two numbers 

#include<stdio.h>

void main()
{
	int a=10,b=20;

	void swap1(int x,int y);
	void swap2(int *ptr1,int *ptr2);

	printf("\n Before swapping : a=%d b=%d ",a,b);
	swap1(a,b);
	printf("\n After swapping by swap1 : a=%d b=%d ",a,b);
	swap2(&a,&b);
	printf("\n After swapping by swap2 : a=%d b=%d \n \n",a,b);
}

void swap1(int x,int y)
{
	int temp;
 
	temp=x;
	x=y; 
	y=temp;
}

void swap2(int *ptr1,int *ptr2)
{
	int temp;
 
	temp=*ptr1;
	*ptr1=*ptr2; 
	*ptr2=temp;
}
 

 /* Output of above code:- 

[root@ugilinux ~]# cc e11Sample1.c
[root@ugilinux ~]# ./a.out

 Before swapping : a=10 b=20 
 After swapping by swap1 : a=10 b=20 
 After swapping by swap2 : a=20 b=10 

*/