Program to convert a lowercase alphabate to uppercase or vice-versa

#include<iostream.h>
#include<conio.h>

void main()
{
clrscr();
char ch;
cout<<"\n Enter an Alphabet : ";
cin>>ch;

if(ch>='a' && ch<='z')
{
cout<<"\n\t You have entered a lowercase alphabet";
ch=ch-32;
cout<<"\n\n The uppercase alphabet is : "<<ch;
}
else
{
cout<<"\n\t You have entered an Uppercase alphabet";
ch=ch+32;
cout<<"\n\n The lowercase alphabet is : "<<ch;
}
getch();
}


                                                       Output