I made a code which calculates the area of things and it works fine, but I can never use it as a function and call it, here goes the variables which I use in the function:
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float x;
float y;
float z;
float area;
int KeepOn;
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and as header I use this:

float CalcArea(float x, float y, float z, float area, int KeepOn)

And here I put it in the main program:
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int main()
{

float CalcArea(float x, float y, float z, float area, int KeepOn);

return 0;

}
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The problem is that the compiler says that it shadows a parameter. As I said, this makes me go CrAZy, HELP WANTED!!!!!!