A simple program to swap two numbers without using the third variable. You have to use some formulas or basic concepts.
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
printf(“enter any number”);
scanf(“%d”,&a);
printf(“enter any number”);
scanf(“%d”,&b);
a=a+b;
b=a-b;
a=a-b;
printf(“%d\n”,a);
printf(“%d\n”,b);
getch();
}
Output:
