Question: (a) Construct a phrase-structure grammar that generates all signed decimal numbers, con sisting of a sign (either or), a nonnegative integer; and a decimal fraction

(a) Construct a phrase-structure grammar that generates all signed decimal numbers,

(a) Construct a phrase-structure grammar that generates all signed decimal numbers, con sisting of a sign (either or), a nonnegative integer; and a decimal fraction that ise ther the empty string or a decimal point followed by a positive integer, where the initial zeros in an integer are allowed. (b) Give the Backus-Naur form for this grammar. c) Construct a derivation tree for -31.4 in this grammar

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