#include <iostream.h>
#include <ctype.h>

/***************************************************************
 Program: if_else_if.C
 An example of "if - else - if" statements  
 This program converts lower case to upper case
***************************************************************/

int main()
{
     char my_char;
     cout << "Enter a lower case letter:";
     cin >> my_char;
     if (my_char < 'a') // test condition
          cout << "Sorry, you must enter a lower case letter. \n";
     else if (my_char > 'z') // nested if
          cout << "Sorry, you must enter a lower case letter. \n";
     else
         {
          char upper_char=toupper(my_char);
          cout << "In upper case " << my_char << " is:" << upper_char <<
endl;
         }
     return(0); 
}