4) The following grammar applies + and * operators to integer and real constants

Question

4) The following grammar applies + and * operators to integer and real constants. The result of adding two integers is type integer, otherwise the result is type real. A number (T) with a decimal point is real, otherwise is integer. Write a syntax directed definition for this grammar to determine the type of each subexpression; if an operation involves mixed integer and real values, convert integer values to real. Write semantic actions to output 3-addres code. Assume the following operators: (If you believe you need any additional 3-address operators, you may add them to the above list). t).

Explanation / Answer

Directed definition for a grammer of arithematic expression:
Expr-> expr+term|term
term-> term*factor|factor
factor-> id|num|(expr)
i.e. expr is a string of terms seperated by + and -.
A term is a string of factors separed by * and /.
A factor is a single operand or an expression wrapped.

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Semantic Analysis

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