5. write a program in c to swap a values of the two variable without using a third variable.

#include <stdio.h>
int main()
{
 int a,b;
 printf(“\n Enter first Number\n”);
 scanf(“%d”,&a);
 printf(“\n Enter second number\n”);
 scanf(“%d”,&b);
 printf(“\n Numbers before swapping”);
 printf(“\n a=%d\nb=%d”,a,b);
 // swap the numbers
 a=a+b;
 b=a-b;
 a=a-b;
 (“\n Numbers after swapping”);
 printf(“\n a=%d\nb=%d”,a,b);

 return 0;
}
Output:
Enter first Number
5
Enter second number
6
Numbers before swapping
a=5
b=6
Numbers after swapping
a=6
b=5