#include <stdio.h>
int main(void)

{
   int n, x;

   int factorial(int n)
   {

      if (x<=0)
      {
         printf("x equals: ");
         return 1;
      }

      else
      {
         return n * factorial(n-1);  //error here
      }

      f(x)=f(x-1)+2;
   }
   return 0;
}

In function 'int main()':
Line 8: error: a function-definition is not allowed here before '{' token
compilation terminated due to -Wfatal-errors.