PROGRAMMING LANGUAGES

Exercise 4 Consider the earlier simple grammar for expressions I a I b I c Suppose the lexical structure of the language allows any number of spaces to occur anywhere in the expression. Give a BNF grammar that defines this explicitly, at the character level, using one grammar to capture both the phrase structure and the lexical structure. For example, your grammarshould generate both (a b) and a b) Use a single-quoted space to indicate the space character in your grammar