SWAP TWO VARIABLES WITHOUT USING THIRD USING C PROGRAM VARIABLE

#include<stdio.h>

int main(){

    int a,b;

    printf("\nEnter two numbers:");

    scanf("%d %d",&a,&b);

    printf("\nBefore swapping a=%d b=%d",a,b);

    a=a^b;

    b=b^a;

    a=a^b;

    printf("\nAfter swapping a=%d b=%d",a,b);

    return 0;

}

OR

Swapping of two number

#include<stdio.h>

int main(){

    int a=5,b=10;

//process one

    a=b+a;

    b=a-b;

    a=a-b;

    printf("a= %d  b=  %d",a,b);

//process two

    a=5;

    b=10;

    a=a+b-(b=a);

    printf("\na= %d  b=  %d",a,b);

//process three

    a=5;

    b=10;

    a=a^b;

    b=a^b;

    a=b^a;

    printf("\na= %d  b=  %d",a,b);

   

//process four

    a=5;

    b=10;

    a=b-~a-1;

    b=a+~b+1;

    a=a+~b+1;

    printf("\na= %d  b=  %d",a,b);

   

//process five

    a=5,

    b=10;

    a=b+a,b=a-b,a=a-b;

    printf("\na= %d  b=  %d",a,b);

    getch();

}