Swapping of two numbers in C

Swapping means simply exchanging the values of two variable.The 5 different method of swapping have
 shown bellow:

• Using Third Variable
• Without Using Third Variable
• Using  Pointer
• Using Function using Call by Reference

Using Third Variable:

Assume that you have cup A filled with water and cup B filled with milk, now to swap or exchange content
 of both cups just take cup C and pour the content of cup B into it , now pour the content of cup A into cup
 B and then pour the content of cup C into cup A.

Thus you have swapped the content of cup A and cup B.Similarly using third variable you can swap the
 values of two variable.The c programming code is given bellow..

Code:

#include <stdio.h>

#include <conio.h>

int main()

{

   int x, y, t;

   printf("Enter the value of x and y\n");

   scanf("%d%d", &x, &y);

   printf("Before Swapping\nx = %d\ny = %d\n",x,y);

   t    = x;

   x    = y;

   y    = t;

   printf("After Swapping\nx = %d\ny = %d\n",x,y);

   getch();

}

Out Put:

Without third Variable:

You can also swap two numbers without using third variable.

Code:

include <stdio.h>
include <conio.h>
void main()
{
   int x, y;

   printf("Enter Value for x and y\n");
   scanf("%d%d", &x, &y);

   x = x + y;
   y = x - y;
   x = x - y;

   printf("x = %d\ny = %d\n",a,b);
   getch();

}

Using Pointer:

Code:

#include<stdio.h>

#include<conio.h>

void main()

{

int a=2,b=3;

swap(a,b);

printf("%d%d",a,b);

getch()

}

swap(int *x,int *y)

{

int t;

t=*x;

*x=*y;

*y=t;

printf("%d%d",x,y);

getch()

}