C program to swap two numbers

Swapping of two numbers in c

#include <stdio.h>

int 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);

   return 0;

}

Output of program:

Enter the value of x and y

10

20

Before Swapping

X=10

Y=20

After Swapping

X=20

Y=10

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>

int 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);

   return 0;

}

Swap two numbers using pointers

#include <stdio.h>

int 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);

   return 0;

}

Swapping numbers using call by reference

In this method we will make a function to swap numbers.

#include <stdio.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);

   return 0;

}

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>

int 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);

  return 0;

}

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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