3. to check whether a character is alphabet or not.

#include<iostream>

using namespace std;

int main()

{

    char ch;

    cout<<"Enter a Character: ";

    cin>>ch;

    if((ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))

        cout<<endl<<ch<<" is an Alphabet";

    else

        cout<<endl<<ch<<" isn't an Alphabet";

    cout<<endl;

    return 0;

}