/*
* C Program to swap two numbers.
*/
// Includes
#include <stdio.h>
/*
* Description : Function to swap 2 integers using call by reference.
* Parameters : iPtr_num1, iPtr_num2 - pointer to numbers to be swapped.
* Returns : Nothing. Swapped numbers are directly reflected in calling function.
*/
void swap(int *iPtr_num1, int *iPtr_num2)
{
float temp;
// Check if both are pointing to same location.
// No need to swap in such scenario.
if (iPtr_num1 == iPtr_num2)
{
return;
}
// Uses temporary variable to swap 2 numbers.
temp = *iPtr_num1;
*iPtr_num1 = *iPtr_num2;
*iPtr_num2 = temp;
}
/*
* Description : Function to swap 2 integers using addition and subtraction.
* Parameters : iPtr_num1, iPtr_num2 - pointer to numbers to be swapped.
* Returns : Nothing. Swapped numbers are directly reflected in calling function.
*/
void swapUsingAddSub(int *iPtr_num1, int *iPtr_num2)
{
// Check if both are pointing to same location.
// No need to swap in such scenario.
if (iPtr_num1 == iPtr_num2)
{
return;
}
// Swap using addition and subtraction method
*iPtr_num1 = *iPtr_num1 + *iPtr_num2;
*iPtr_num2 = *iPtr_num1 - *iPtr_num2;
*iPtr_num1 = *iPtr_num1 - *iPtr_num2;
}
/* swapUsingBitwise
* Description : Function to swap 2 integers using bitwise operators.
* Parameters : iPtr_num1, iPtr_num2 - pointer to numbers to be swapped.
* Returns : Nothing. Swapped numbers are directly reflected in calling function.
*/
void swapUsingBitwise(int *iPtr_num1, int *iPtr_num2)
{
// Check if both are pointing to same location.
// No need to swap in such scenario.
if (iPtr_num1 == iPtr_num2)
{
return;
}
// Swap using bitwise operators
*iPtr_num1 = *iPtr_num1 ^ *iPtr_num2;
*iPtr_num2 = *iPtr_num1 ^ *iPtr_num2;
*iPtr_num1 = *iPtr_num1 ^ *iPtr_num2;
}
/* swapUsingMultDiv
* Description : Function to swap 2 integers using multiplication and division.
* Parameters : iPtr_num1, iPtr_num2 - numbers to be swapped.
* Returns : Nothing. Swapped numbwes are directly reflected in calling function.
*/
void swapUsingMultDiv(float *iPtr_num1, float *iPtr_num2)
{
// Check if both are pointing to same location.
// No need to swap in such scenario.
if (iPtr_num1 == iPtr_num2)
{
return;
}
// Swap using multiplication and division method
*iPtr_num1 = (*iPtr_num1) * (*iPtr_num2);
*iPtr_num2 = (*iPtr_num1) / (*iPtr_num2);
*iPtr_num1 = (*iPtr_num1) / (*iPtr_num2);
}
int main()
{
int i_num1, i_num2;
float f_num1, f_num2;
printf("Enter numbwes to be swapped : ");
scanf("%d %d",&i_num1, &i_num2);
// Swap 2 numbers and print
swap(&i_num1, &i_num2);
printf("Swapped (%d,%d)\n",i_num1, i_num2);
swapUsingAddSub(&i_num1, &i_num2);
printf("Swapped using add-sub (%d,%d)\n",i_num1, i_num2);
swapUsingBitwise(&i_num1, &i_num2);
printf("Swapped using bitwise xor (%d,%d)\n",i_num1, i_num2);
// For multiplication-division method, arguments needs to be float
f_num1 = i_num1; // implicit type casting will take place.
f_num2 = i_num2; // implicit type casting will take place.
swapUsingMultDiv(&f_num1, &f_num2);
printf("Swapped using mult-div (%g,%g)\n",f_num1, f_num2);
}
