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SwapVals.cpp
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SwapVals.cpp
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/****** Exchange values between any two variables in C++. ********
** Source Code: SwapVals.cpp **
** Author: Gustavo Islas Gálvez. **
** Creation Date: Saturday, September 30, 2023. **
** Purpose: This program uses a function that uses **
** templates in its formal parameters and **
** that specifically takes care of **
** swapping any two values and returning **
** them inverted. **
** +---!----+---!----+---!----++---!----+---!----+---!----+--- **
** Test Values: **
** Left Value [x] : 100. **
** Right Value [y] : 200. **
****************************************************************/
//C Standard Libraries.
#include <iostream>
#include <stdio.h>
//Work Symbolic Constants.
#define V_ZERO 0
/*****************************************************************
** Function: template <typename T> void swapper **
** (T *ptr_t_left_value, **
** T *ptr_t_right_value). **
** Explanation: This function doesn't actually return **
** any value, it just swaps two variables **
** that are passed to that function as **
** formal parameters in its function header**
** and swaps them between them, so it uses **
** a template and references to the memory **
** addresses of said variables. **
** Input Parms: T *ptr_t_left_value, **
** T *ptr_t_right_value. **
** Outputt Parms: T *ptr_t_left_value, **
** T *ptr_t_right_value. **
** Result: This function primarily swaps the values**
** of two variables passed as current **
** parameters and returns them in the same **
** way in the same variables. **
****************************************************************/
template <typename T>
void swapper(T *ptr_t_left_value, T *ptr_t_right_value)
{
T t_aux_value, *ptr_t_aux_value = &t_aux_value;
/*------------------------------------------------
* Variables occupying an intermediate temporary--
* variable in the scope of this function are --
* swapped. --
*----------------------------------------------*/
*ptr_t_aux_value = *ptr_t_left_value;
*ptr_t_left_value = *ptr_t_right_value;
*ptr_t_right_value = *ptr_t_aux_value;
}
/*****************************************************************
** Function: template <typename T> void swapper **
** (T &t_left_value, **
** T &t_right_value). **
** Explanation: This function doesn't actually return **
** any value, it just swaps two variables **
** that are passed to that function as **
** formal parameters in its function header**
** and swaps them between them, so it uses **
** a template and references to the memory **
** addresses of said variables. **
** Input Parms: T &t_left_value, **
** T &t_right_value. **
** Outputt Parms: T &t_left_value, **
** T &t_right_value. **
** Result: This function primarily swaps the values**
** of two variables passed as current **
** parameters and returns them in the same **
** way in the same variables. **
****************************************************************/
template <typename T>
void swapper (T &t_left_value, T &t_right_value)
{
T t_aux_value; //Template variable declaration.
/*------------------------------------------------
* Variables occupying an intermediate temporary--
* variable in the scope of this function are --
* swapped. --
*----------------------------------------------*/
t_aux_value = t_left_value;
t_left_value = t_right_value;
t_right_value = t_aux_value;
}
/*****************************************************************
** Function: main. **
** Explanation: The main function of this program shows **
** a series of messages before and after **
** calling a generic function that **
** exchanges the values contained in two **
** variables and shows their respective **
** results before and after the operation **
** executed by said exchange function. **
** Input Parms: None. **
** Output Parms: None. **
** Result: The main function, itself, just displays**
** a series of messages before and after **
** exchanging the value of two **
** user-supplied variables. **
** +---!----+---!----+---!----++---!----+---!----+---!----+--- **
** Test Values: **
** Left Value [x] : 100. **
** Right Value [y] : 200. **
****************************************************************/
int main()
{
/* Initialization of preliminary variables. */
int int_t_left_value = V_ZERO;
int int_t_right_value = V_ZERO;
int *ptr_int_t_left_value = &int_t_left_value;
int *ptr_int_t_right_value = &int_t_right_value;
/* Incomings request window. */
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Change of place of any values. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "Enter two numeric values:" << std::endl;
std::cout << "Value [x] : ";
std::cin >> int_t_left_value;
std::cout << "Value [y] : ";
std::cin >> int_t_right_value;
/* Call to the function that only changes the values of the specified variables. */
/* Messages before the exchange of values. */
std::cout << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Starting values. Before the exchange. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Source input variables. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &int_t_left_value << "] = [" << int_t_left_value << "]." << std::endl;
std::cout << "| Value [y] : [" << &int_t_right_value << "] = [" << int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Source mapping pointers. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &ptr_int_t_left_value << "]." << std::endl;
std::cout << "| Value [x] : [" << ptr_int_t_left_value << "] = [" << *ptr_int_t_left_value << "]." << std::endl;
std::cout << "|---+----+---+----+---+----+---+----+---|" << std::endl;
std::cout << "| Value [y] : [" << &ptr_int_t_right_value << "]." << std::endl;
std::cout << "| Value [y] : [" << ptr_int_t_right_value << "] = [" << *ptr_int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
/* Messages after the exchange of values. */
swapper(int_t_left_value, int_t_right_value); //First Function that swaps variables.
std::cout << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Values exchanged. After the exchange. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Source input variables. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &int_t_left_value << "] = [" << int_t_left_value << "]." << std::endl;
std::cout << "| Value [y] : [" << &int_t_right_value << "] = [" << int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Source mapping pointers. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &ptr_int_t_left_value << "]." << std::endl;
std::cout << "| Value [x] : [" << ptr_int_t_left_value << "] = [" << *ptr_int_t_left_value << "]." << std::endl;
std::cout << "|---+----+---+----+---+----+---+----+---|" << std::endl;
std::cout << "| Value [y] : [" << &ptr_int_t_right_value << "]." << std::endl;
std::cout << "| Value [y] : [" << ptr_int_t_right_value << "] = [" << *ptr_int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
/* Value restore messages. */
swapper(&int_t_left_value, &int_t_right_value); //Second Function that swaps variables.
std::cout << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Restoring initial values. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Source input variables. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &int_t_left_value << "] = [" << int_t_left_value << "]." << std::endl;
std::cout << "| Value [y] : [" << &int_t_right_value << "] = [" << int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Source mapping pointers. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &ptr_int_t_left_value << "]." << std::endl;
std::cout << "| Value [x] : [" << ptr_int_t_left_value << "] = [" << *ptr_int_t_left_value << "]." << std::endl;
std::cout << "|---+----+---+----+---+----+---+----+---|" << std::endl;
std::cout << "| Value [y] : [" << &ptr_int_t_right_value << "]." << std::endl;
std::cout << "| Value [y] : [" << ptr_int_t_right_value << "] = [" << *ptr_int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
/* Call to the function that only changes the pointers of the specified variables. */
/* Messages before the exchange of values. */
swapper(ptr_int_t_left_value, ptr_int_t_right_value); //First Function that swaps pointers.
std::cout << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Values exchanged. After the exchange. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Source input variables. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &int_t_left_value << "] = [" << int_t_left_value << "]." << std::endl;
std::cout << "| Value [y] : [" << &int_t_right_value << "] = [" << int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Source mapping pointers. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &ptr_int_t_left_value << "]." << std::endl;
std::cout << "| Value [x] : [" << ptr_int_t_left_value << "] = [" << *ptr_int_t_left_value << "]." << std::endl;
std::cout << "|---+----+---+----+---+----+---+----+---|" << std::endl;
std::cout << "| Value [y] : [" << &ptr_int_t_right_value << "]." << std::endl;
std::cout << "| Value [y] : [" << ptr_int_t_right_value << "] = [" << *ptr_int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
/* Value restore messages. */
swapper(*ptr_int_t_left_value, *ptr_int_t_right_value); //Second Function that swaps pointers.
std::cout << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Restoring initial values. |" << std::endl;
std::cout << "+===|====+===|====+===|====+===|====+===|" << std::endl;
std::cout << "| Source input variables. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &int_t_left_value << "] = [" << int_t_left_value << "]." << std::endl;
std::cout << "| Value [y] : [" << &int_t_right_value << "] = [" << int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Source mapping pointers. |" << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
std::cout << "| Value [x] : [" << &ptr_int_t_left_value << "]." << std::endl;
std::cout << "| Value [x] : [" << ptr_int_t_left_value << "] = [" << *ptr_int_t_left_value << "]." << std::endl;
std::cout << "|---+----+---+----+---+----+---+----+---|" << std::endl;
std::cout << "| Value [y] : [" << &ptr_int_t_right_value << "]." << std::endl;
std::cout << "| Value [y] : [" << ptr_int_t_right_value << "] = [" << *ptr_int_t_right_value << "]." << std::endl;
std::cout << "+---|----+---|----+---|----+---|----+---|" << std::endl;
return V_ZERO;
}