file - null type and compiler error in c -

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I have used an online compiler to compile the following code, and it puts an error which says: "Undesired undeclared (first use in this function)" I do not understand where the problem is, as I thought we do not need to declare zero. 

  int main (int argc, char * argv []) {FILE * f; F = fopen (argv [1], "r"); Four strings [17]; While (fgets (string, 17, f)! = Null) {........

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