What does "function ?? declared implicitly" means?

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lim daehee 2023-9-11

评论： lim daehee ，2023-9-12

Hi, I'm trying to integrate my c code to simulink.

I made a header file and a source file named file.h and file.c.

and there is a function named function1 and the code is stated below.

function1(void)
{
    static double a;
    a = a+1;
    return a;
}

Next, I made a C caller block and typed like below.

function1();

After that, I ran my code and the error is stated like this.

In line 1:error: 223, function "function1" declared implicitly

| function1();

| ^

How can I solve this error?

Bruno Luong 2023-9-11

编辑：Bruno Luong 2023-9-11

you need add double as return type for your function prototype and declaration

double function1(void);

double function1(void)

{

...

}

lim daehee 2023-9-12

Dear Bruno Luong,

I finally found my problem.

I forgot including my c files in my simulation target..

Thanks for your help:)

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