Question

Write functions squareByValue, squareByRef, squareByPointer that find the square of an integer, in three different ways:

a)squareByValue should return the square of the number, passing the argument by value.

b)squareByRef should modify the variable in the input to its square, passing by reference.

c)squareByPointer should also modify the variable in the input to its square, but passing the argument by pointer.

Answer 1

square.cpp

#include<iostream>
using namespace std;

//n has value of x
int squareByValue(int n)
{
   //return square of n
   return n*n;
}

//reference to y
void squareByRef(int &n)
{
   //update n
   n=n*n;
}

//point to the z
void squareByPointer(int *n)
{
   //update value pointed by pointer
   *n = *n * *n;
}

int main()
{
   int x=5;
   //x will be passed
   cout<<"Square by Value: "<<squareByValue(x)<<endl;
  
   int y=6;
   //y will be passed
   squareByRef(y);
   cout<<"Square by Reference: "<<y<<endl;
  
   int z=7;
   //address should of z be passed
   squareByPointer(&z);
   cout<<"Square by Pointer: "<<z<<endl;
   return 0;
}

output screenshot: