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 toupper()               Convert 'c' to Uppercase, if Appropriate (Macro)

 #include   <ctype.h>

 int        toupper(c);
 int        c;                           Character to be converted

    toupper() is a macro that converts 'c' to uppercase.  The conversion
    is made if 'c' is a lowercase letter; if not, 'c' remains unchanged.

    Returns:    The converted character 'c'; no error return.

      Notes:    toupper() is a macro, but the library contains a function
                version (declared in <stdlib.h>) because the macro
                toupper() does not correctly handle 'c' arguments with
                side effects.  To use the function version, remove the
                definition of toupper() from <ctype.h> with #undef or do
                not include the header <ctype.h>.

   -------------------------------- Example ---------------------------------

    The following statements convert the characters in 'string' to
    uppercase before printing them out.

           #include <ctype.h>
           #include <stdio.h>

           char string[15] = "Alphabet Soup";
           int x;

           main()
           {
               for (x = 0; x < strlen(string); x++)
                   printf("%c",toupper(string[x]));
               printf("\n");
           }