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Tuesday, May 6, 2014

C program to swap two numbers

Swapping of two numbers in c

#include <stdio.h>
#include<conio.h> 
void main()
{
   int x, y, temp;
   printf("Enter the value of x and y\n");
   scanf("%d%d", &x, &y);
   printf("Before Swapping\nx = %d\ny = %d\n",x,y);
   temp = x;
   x    = y;
   y    = temp;
   printf("After Swapping\nx = %d\ny = %d\n",x,y);
   getch();
}

Swapping of two numbers without third variable

/*You can also swap two numbers without using temp or temporary or third variable. In that case c program will be as shown :-   */

#include <stdio.h>
#include<conio.h> 
void main()
{
   int a, b;
   printf("Enter two integers to swap\n");
   scanf("%d%d", &a, &b);
   a = a + b;
   b = a - b;
   a = a - b;
   printf("a = %d\nb = %d\n",a,b);
   getch();
}
To understand above logic simply choose a as 7 and b as 9 and then do what is written in program. You can choose any other combination of numbers as well. Sometimes it's a good way to understand a program.

Swap two numbers using pointers

#include <stdio.h>
#include<conio.h> 
void main()
{
   int x, y, *a, *b, temp;
   printf("Enter the value of x and y\n");
   scanf("%d%d", &x, &y);
   printf("Before Swapping\nx = %d\ny = %d\n", x, y);
   a = &x;
   b = &y;
   temp = *b;
   *b   = *a;
   *a   = temp;
   printf("After Swapping\nx = %d\ny = %d\n", x, y);
   getch();
}

Swapping numbers using call by reference

/*In this method we will make a function to swap numbers.*/
#include <stdio.h>
#include<conio.h> 
void swap(int*, int*);
int main()
{
   int x, y;
   printf("Enter the value of x and y\n");
   scanf("%d%d",&x,&y);
   printf("Before Swapping\nx = %d\ny = %d\n", x, y);
   swap(&x, &y); 
   printf("After Swapping\nx = %d\ny = %d\n", x, y);
   getch();
}
void swap(int *a, int *b)
{
   int temp;
   temp = *b;
   *b   = *a;
   *a   = temp;   
}

C programming code to swap using bitwise XOR

#include <stdio.h>
#include<conio.h> 
void main()
{
  int x, y;
  scanf("%d%d", &x, &y);
  printf("x = %d\ny = %d\n", x, y);
  x = x ^ y;
  y = x ^ y;
  x = x ^ y;
  printf("x = %d\ny = %d\n", x, y);
  getch();
}

Swapping is used in sorting algorithms that is when we wish to arrange numbers in a particular order either in ascending order or in descending.

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