C Programming Tutorial - isupper

#include<stdio.h>

#include<ctype.h>


int main() {

  int apple = 'f';

  if( isalpha(apple)) {
     
if( isupper(apple)) {

      printf("%c is an upper case letter", apple);
  }else{
      printf("%c is a lower case letter", apple);
  }

}

else {

    if( isdigit(apple)) {

        printf("%c is a number", apple);

    }else {

        printf("%c is a OMG WTF is that!? ", apple);

        }

}

       

return 0 ;

}