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Home/ Questions/Q 3968204
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T03:48:51+00:00 2026-05-20T03:48:51+00:00

I cannot sort a compile time error. I am compiling C project. My main.c

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I cannot sort a compile time error. I am compiling C project. My main.c file has an #include where it can pick up the definition of a structure I am using for my project. The point is that each time that I am trying to compile my code I have the error

struct Mystruct* ps = (struct Mystruct* )malloc( sizeof(Mystruct) ); // I have this
// error at compile time

error: 'Mystruct' undeclared (first use in this function)

How it can be why the compiler is not able to read the structure definition?
The include folders are set correctly

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  1. Editorial Team
    Editorial Team
    2026-05-20T03:48:52+00:00Added an answer on May 20, 2026 at 3:48 am

    Sounds like you need to either use sizeof(struct Mystruct) in your expression or use a typedef struct Mystruct Mystruct somewhere. In C, structs have their own namespace.

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