38 : C Program to Swap two numbers without using a temperory variable

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Last program we saw how to swap two numbers, now lets see how to swap them without using a temp variable.

This can be done in 3 steps :

1. Add both number_a and number_b and store it in number_a variable.

2. Subtract number_b from number_a and store it in number_b (number_b has value of number_a)

3. Now, subtract number_b from number_a and store it in number_a (number_a now has value of

Variables :

1. number_a : Datatype int : Holds value of number A inputted by the user.

2. number_b : Datatype int : Holds value of number B inputted by the user.



Functions :

printf() : is used to display something on the console/screen. Format specifier %d in printf function is used to display a int variable on screen and %f for float. \n is used to add a newline

scanf() : is used to fetch data inputted by the user on the console/screen using keyboard. %d in scanf is indicates that inputted text is of type int. 








/*
 * 1000+ C programs + tutorials
 *
 * 
 * 34_swap_two_numbers_without_using_temp_variable.c
 *
 *
 *  Created on: Oct 20, 2014
 *  Author: Code2care.org
 */

#include 
//#include 



void main() {

   int number_a;
   int number_b;
  

//    clrscr();

    printf("C Program to Swap values to two variables without without using temp variable :  ");

    printf("\n\n Enter value for variable A  : ");
    scanf("%i", &number_a);
    
   
    printf("\n\n Enter value for variable B  : ");
    scanf("%i", &number_b);
    
     printf("\n\n Before Swapping => Value A : %i    B : %i ",  number_a,number_b);
     
     
   //Swapping logic
   
   number_a = number_a + number_b;
   number_b = number_a - number_b;
   number_a = number_a - number_b;
   
    printf("\n\n After Swapping => Value A : %i    B : %i ",  number_a,number_b);
  


//	getch();



}








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