Click above to get retro games delivered to your door ever month!

 _toupper()              Convert 'c' to Uppercase (Macro)

 #include   <ctype.h>

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

    The _toupper() macro converts 'c' to uppercase.  It should only to be
    used when 'c' is known to be lowercase.  The result of _toupper() is
    undefined if 'c' is not a lowercase letter.

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

      Notes:    Use toupper() to convert characters that are not
                necessarily lowercase letters.

 Portability:   Not supported by ANSI standard.

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

    The following statements convert 'string' to uppercase if needed.

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

           char string[15] = "alphabet";
           int x;

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