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Asked: 2026-05-19T21:45:09+00:00

while reading from BRUCE ECKEL’S THINKING IN C++..i came across the following text In

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while reading from BRUCE ECKEL’S THINKING IN C++..i came across the following text

In c++,a variable can be define at any point in a scope,so it might be seem that storage for variable may not be define until its point of definition .It’s actually more likely that the compiler will follow in c of allocating all the storage for a scope at the opening brace of scope.

Doubt:I guess its only for storage allocating at stack but my doubt is how compiler get to know that how many objects(or not even a one) is defined inside the main(or other fn) before reaching to its definition in order to allocate storage at the opening brace of scope.

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  1. Editorial Team

    The compiler can analyze the entire function before actually emitting any code. Typically, the compiler will work out, for each braced segment, how much storage is required, and add a single assembly instruction in the function prologue to adjust the stack pointer by that many bytes.

    Actually initializing the variables, however, occurs at the appropriate point in the code.

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