C++ Program to Check a Character is Uppercase, Lowercase, Digit or Special Character

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

void main()
{      
char ch; clrscr();    
cout<<"Enter any character: ";
cin>>ch;

if(ch>=65&&ch<=90)    

{
cout<<endl<<"You entered an uppercase character";
}

else if(ch>=48&&ch<=57)
{
cout<<endl<<"You entered a digit";
} 

else if(ch>=97&&ch<=122)
{
cout<<endl<<"You entered a lowercase character";
}

else
cout<<endl<<"You entered a special character";

getch();
}

First of all I read a character an then compare it with ASCII values given below.

Uppercase Alphabet: 65-90

Lowercase Alphabet: 97-122

Digit: 48-57

If ASCII value of character is other then the values mentioned above then it is a special character.