Question

Using a programming language of your choice, write a complete and fully functional program that uses reference and pointer types to swap two integer numbers. The two numbers are read in separately by the program’s user. Use a proper prompt for each number read in.

a. Use one function that uses formal parameter reference type to swap the two numbers

b. Use another function that uses formal parameter pointer type to swap the two numbers.

c. In the main or driver function, call these two functions with the actual arguments received from the program’s user

d. Display immediately the result of the swapping after each function call in the calling function (the main function or the driver) before the next function call to see whether the numbers are swapped. Use the proper display messages.

Code:

#include<iostream>
#include<iomanip>
using namespace std;
// function to swap variables using reference
void swap_ref(int& n1, int& n2)
{
int temp;
temp = n1;
n1 = n2;
n2 = temp;
}
//function to swap variables using pointers
void swap_ptr(int *p, int *q)
{
int temp;
temp=*p;
*p = *q;
*q=temp;
}
int main()
{
//variable to store the input values
int x,y;
  
//temporary variables
int t1,t2;
  
// user input from the user
cout<<"Enter a integer point number: ";
cin>> x;
  
cout<<"\nEnter another integer point number: ";
cin>>y;
  
//copying the input values to temporary variables
t1=x;
t2=y;
  
cout<<"\n\nSwapping the variables using reference\n";
  
// the value of x and y before swapping
cout<<"\n\nBefore Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
//calling the function
swap(x,y);
  
//the value of x,y after swapping
cout<<"\n\nAfter Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
// reinitialize the value of x and y to user input values
x=t1;
y=t2;
  
cout<<"\n\nSwapping the variables using pointers\n";
// the value of x and y before swapping
cout<<"\nBefore Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
//calling the function
swap_ptr(&x,&y);
  
//the value of x,y after swapping
cout<<"\n\nAfter Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
return 0;
}

Answer 1

#include<iostream>
#include<iomanip>
using namespace std;
// function to swap variables using reference
void swap_ref(int& n1, int& n2)
{
int temp;
temp = n1;
n1 = n2;
n2 = temp;
}
//function to swap variables using pointers
void swap_ptr(int *p, int *q)
{
int temp;
temp=*p;
*p = *q;
*q=temp;
}
int main()
{
//variable to store the input values
int x,y;
  
//temporary variables
int t1,t2;
  
// user input from the user
cout<<"Enter a integer point number: ";
cin>> x;
  
cout<<"\nEnter another integer point number: ";
cin>>y;
  
//copying the input values to temporary variables
t1=x;
t2=y;
  
cout<<"\n\nSwapping the variables using reference\n";
  
// the value of x and y before swapping
cout<<"\n\nBefore Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
//calling the function
swap(x,y);
  
//the value of x,y after swapping
cout<<"\n\nAfter Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
// reinitialize the value of x and y to user input values
x=t1;
y=t2;
  
cout<<"\n\nSwapping the variables using pointers\n";
// the value of x and y before swapping
cout<<"\nBefore Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
//calling the function
swap_ptr(&x,&y);
  
//the value of x,y after swapping
cout<<"\n\nAfter Swapping\n"<<endl;
cout<<"The value of x is : "<<setprecision(2)<<fixed<<x<<endl;
cout<<"The value of y is : "<<setprecision(2)<<fixed<<y;
  
return 0;
}