Synopsis:

       upper_str=strupr(str)

Arguments:

       str - The string to convert to upper case

Description:  This function converts the specified string str to upper case characters.

For example:

       string="the cat sat on the mat"

       // This will return "THE CAT SAT ON THE MAT"

       upper_str=strupr(string);

Returns:  Returns the str with all lower case characters converted to upper case.