previous implicit declaration of 'differences' was here

[hello234]

does anyone know what this error message means?

i am using a function that i have not previously declared (because i cannot get that to work... another story) and this is the message it gives me.

when i declare it up top, it gives me the same message up there

any thoughts on what this means? any responses are greatly appreciated this is very frustrating

[hello234]

'differences' is the function name

[tabstop]

That's exactly what the error message is telling you: you are using a function that you have not previously declared.

You need at least a prototype, if not the function definition, before any call to that function is made.

[hello234]

i have used the declaration

void function(int, float, int, int, float);

and then where i do that it tells me "previous declaration of 'function' was here

[hello234]

also i should add-- thank you for your response

[tabstop]

Is that the previous declaration, or is that the line with the warning? 'Cause there are going to be two different lines listed here, obviously; the first line where the error is, and then a different line where the previous declaration was.

Anyway, the two don't match (the use and the declaration). So fix that.

Edit: To be more specific, your file must look like the following:

void function(int, float, int, int, float);

int main(void) {
    /* things happen here */
}

void function(int a, float b, int c, int d, float e) {
    /* the actual function is here */
}