Programming Example

Program to show swap of two no's without using third variable.

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Program to show swap of two no’s without using the third variable.

Program Code

#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
 
	printf("enter value for a & b: \n");
	scanf("%d%d",&a,&b);
	printf("Before swapping the value of a=%d & b=%d \n",a,b);
	a=a+b;
	b=a-b;
	a=a-b;
	printf("After swapping the value of a=%d & b=%d \n",a,b);
 
}

Output

enter value for a & b:
2  3
Before swapping the value of a=2 & b=3
After swapping the value of a=3 & b=2
Press any key to continue . . .

Explanation

Program to show swap of two no’s without using the third variable.

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.