How to Swap two number without using third variable using "c language"?

 

Hello Friend’s

Today we are going to learn about how to swap two number without using third variable this is very easy am going to tell you how?

Simply we are take two variable suppose “a” and “b” then we are going to use formula or relation between ‘a’ and ‘b’ . those formula are like that

Simply we are make a=a+b therefore ‘a’ has both the value and then we are substracting ‘b’ by a then we get ‘b’ and same thing done by ‘a’ and we are able to swap the number . below am going to write in mathematical form

1.           a=a+b
2.            b=a-b
3.           a=a-b

       I hope so now you can understand well

    

So now we are write code for that …..

#include<stdio.h>

int main(){

    int a,b;

    printf("enter the value of a=");

    scanf("%d",&a);

    

    printf("enter the value of b=");

    scanf("%d",&b);

    a=a+b;

    b=a-b;

    a=a-b;

    printf("value of a and b after swap\n");

    printf("a=%d,b=%d",a,b);

    return 0;

}

OUTPUT:-

enter the value of a=12

enter the value of b=3

value of a and b after swap

a=3,b=12