Question

Last Coding Question! C++ is the programming language used

This one is very difficult. My to do list is as follows:

// This program uses a function to swap the values in two variables.

/*TO DO:
change the function swapNums to use two pointer parameters instead of two reference parameters, and
then modify the complete program accodingly.
*/

#include <iostream>
using namespace std;

// Function prototype
void swapNums(int&, int&);

/***** main *****/
int main()
{
int num1 = 5,
num2 = 7;

// Print the two variable values
cout << "In main the two numbers are "
<< num1 << " and " << num2 << endl;

// Call a function to swap the values stored
// in the two variables
swapNums(num1, num2);

// Print the same two variable values again
cout << "Back in main again the two numbers are "
<< num1 << " and " << num2 << endl;
  
return 0;
}

/***** swapNums *****/
void swapNums(int& a, int& b)   
{ // Parameter a receives num1 and parameter b receives num2
// Swap the values that came into parameters a and b
int temp = a;
a = b;
b = temp;

// Print the swapped values
cout << "In swapNums, after swapping, the two numbers are "
<< a << " and " << b << endl;
}

Answer 1

#include <iostream>

using namespace std;

// Function prototype
void swapNums(int *, int *);

/***** main *****/
int main() {
    int num1 = 5, num2 = 7;

// Print the two variable values
    cout << "In main the two numbers are " << num1 << " and " << num2 << endl;

// Call a function to swap the values stored
// in the two variables
    swapNums(&num1, &num2);

// Print the same two variable values again
    cout << "Back in main again the two numbers are " << num1 << " and " << num2 << endl;

    return 0;
}

/***** swapNums *****/
void swapNums(int *a, int *b) { // Parameter a receives num1 and parameter b receives num2
// Swap the values that came into parameters a and b
    int temp = *a;
    *a = *b;
    *b = temp;

// Print the swapped values
    cout << "In swapNums, after swapping, the two numbers are " << *a << " and " << *b << endl;
}