C program to exchange the values in two variables (swap) with and without using temporary variables.

//to swap the values of variable without using third variable

main()

{

int a,b;

printf("Enter the value of variable a\n");

scanf("%d",&a);

printf("Enter the value of variable b\n");

scanf("%d",&b);

printf("a=%d\nb=%d\n",a,b);

a=a+b;

b=a-b;

a=a-b;

printf("Swaping done....\n");

printf("Now a=%d\nb=%d\n",a,b);

system("pause");

}