08. Assume that our language specifically permits you to assign an integer value

Question

08. Assume that our language specifically permits you to assign an integer value to a real variable. The compiler handles this mixed mode by generating code to perform data conversion from an integer to a real representation. Consider the following declarations int x; double y: The assignment statement y -x is legal in this language. Explain how a compiler handles the previous assignment statement. You do not have to show the exact code that would be generated; just describe how a compiler deals with the statement, and show at what point in the code generation process the compiler discovers that it needs to produce the data conversion instructions

Explanation / Answer

Solution:

So in the compiler, the syntax is defined based on the strings generated by the integer double, which is present in the form of some syntax tree which is built on some grammar; context-free grammar most of the times.

So as soon as the regular expression of real to integer is encountered in after the lexical analysis in the compiler then the compiler implicitly does the typecasting at the compile time and at the runtime there won't be an issue of the typecasting.

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