1. WAP to swap two numbers without using a third variable.

#include<stdio.h>
#include<conio.h>
void main()
{
   int num1, num2;
   clrscr();
   printf("Enter first number: ");
   scanf("%d", &num1);
   printf("Enter second number: ");
    scanf("%d", &num2);
   printf("-----------------------\n\n");
    printf("--- Before Swapping ---\n");
   printf("First Number = %d", num1);
   printf("\nSecond Number = %d", num2);
   num1 = num1 + num2;
   num2 = num1 - num2;
   num1 = num1 - num2;
   printf("\n\n--- After Swapping ---\n");
   printf("First Number = %d", num1);
   printf("\nSecond Number = %d", num2);
    getch();
}


OUTPUT:

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