R4R C C ExamplesSwap two number using two variables

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  Swap two number using two variables

In this example we are going two swap two numbers using two variables.

Here first insert two values from keyboard then add these two values and store values it into one variable. Then second variable value is stored value -second value and first variable value is stored value- second variable value.

This is like

a=a+b;

b=a-b=a+b-b=a;

a=a-b=a+b-a=b;

So value of variables are sapped.

/* swap two number using two variables */
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
printf("Enter the two numbers\t");
scanf("%d%d",&a,&b);
a=a+b;
b=a-b;
a=a-b;
printf("\n Swapped numbers a=%d b=%d",a,b);
getch();
}

Output Of Example