c:string:isalpha

isalpha

Syntax:

    #include <cctype>
    int isalpha( int ch );

The function isalpha() returns non-zero if its argument is a letter of the alphabet. Otherwise, zero is returned.

     char c;
     scanf( "%c", &c );
     if( isalpha(c) )
       printf( "You entered a letter of the alphabet\n" );