Ex 3A..Call by value & Call by reference.cpp

#include<iostream>
#include<conio.h>
using namespace std;
int main(void)
{

     int x,y,n;
     void swap1(int,int);
     void swap2(int*x,int*y);
     cout<<"enter two values to be swapped\n";
     cin>>x>>y;
     cout<<"\nfor CALL BY VALUE press1";
     cout<<"\nfor CALL BY REFERENCE press2";
     cin>>n; switch(n) {
          case 1: cout<<"\nCALL BY VALUE";
          cout<<"\nvalues before swap()"<<x<<"\t"<<y;
          swap1(x,y);
          cout<<"\nafter swap outside of swap1()";
          cout<<"\nx="<<x<<"\ny="<<y;
          break;
          case 2:
              cout<<"\nCALL BY REFERENCE";
              cout<<"\nvalue before swap"<<x<<y;
              swap2(&x,&y);
              cout<<"\nafter swap(outside of swap2)"<<x<<y;
              break;
              }
               getch();
               }
                void swap1(int x,int y)
                {
                     int temp;
                     temp=x;
                     x=y;
                     y=temp;
                     cout<<"\nswapped values(inside swap1())"<<x<<"\t"<<y;

                      }
                       void swap2(int *x,int *y)
                       {
                            int temp;
                            temp=*x;
                            *x=*y;
                            *y=temp;
                            cout<<"\nswapped value(inside swap2())"<<*x<<"\t"<<*y;
                            }