If c is a lowercase character, the expression c – 'a' + 'A' produces the uppercase equivalent of c, assuming an ASCII character set. Write a function called uppercase() that converts all lowercase...

If c is a lowercase character, the expression

c – 'a' + 'A'

produces the uppercase equivalent of c, assuming an ASCII character set.

Write a function called uppercase() that converts all lowercase characters in a string into their uppercase equivalents.