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You need to declare it first. A function declaration is made of three parts:

The kind of data the function returns, I.E. void, int, etc.

The name of the function, I.E. helloWorld.

The list of parameters in parentheses, I.E. (A as int, B as char)

For an example, here it is:

void helloWorld();

Now, to put something inside the function, you can write the following:

void helloWorld()

{

printf("Hello world!");

}

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