Swapping

C program to swap two numbers with and without using third vaiable, swapping in c using pointers,function and using bitwise XOR operator, swapping means interchanging. For example if in your c program you have taken two variable a and b where a = 4 and b = 5, then before swapping a = 4, b = 5 after swapping a = 5, b = 4

In our c program to swap numbers we will use a temp variable to swap two numbers.

Swapping of two numbers in c

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#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; }

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 :-

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#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; }

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

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.

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#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; }

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