Thread: Declared identifier reported as undeclared

I'm doing an exercise out of a book I've been using (Deitel: C How to Program) and I'm trying to make a program that determines perfect numbers.

Everything was going well but all the sudden it is saying alot of my variables aren't declare and there is a problem with my function!

Code:

exercise3.c:44: error: syntax error before "int"
exercise3.c:45: error: redeclaration of `check'
exercise3.c:44: error: `check' previously declared here
exercise3.c:62: error: `counter' undeclared (first use in this function)
exercise3.c:62: error: (Each undeclared identifier is reported only once
exercise3.c:62: error: for each function it appears in.)

Code:

#include <stdio.h>

int perfect(int number);

int main()
   {
   int input = 0, factor1, factor2, counter = 2, check = 0;

   scanf("%d", &input);

   counter = 2;

   if ( perfect(input) == 1)
      {
      printf("%d is a perfect number\n", input);
      
      for(factor1 = 2; factor1 <= (input - 1); ++factor1)
         {
         for (factor2 = 2; factor2 <= (input - 1); ++factor2)
            {
            if ( (factor1 * factor2) == input)
               {
                  if (factor1 != check && factor2 != check)
                  {

                     if ( (counter % 2) == 0)                
                        check = factor2;
                     ++counter;
                  printf("%d + %d + ", factor1, factor2);
                  }
               }
            }
         }
      printf("1 = %d\n", input);
      }

 

   return 0;
   }

int perfect (int number)
{
int factor1, factor2, check = 0, perfect = 0, int counter = 2;
int check = 2;

for (factor1 = 2; factor1 <= (number - 1); ++factor1)
   {
   for (factor2 = 2; factor2 <= (number - 1); ++factor2)
      {

      if ( (factor1 * factor2) == number)
         {
/* -------------------------------------------------------------------------------------- */
/* the check needs to be worked out to register at the half way point through             */ 
/* factoring so numbers aren't counted twice                                              */
/* -------------------------------------------------------------------------------------- */  
       if (factor1 != check && factor2 != check)
            {
            perfect = perfect + factor1 + factor2;

            if ( (counter % 2) == 0 )
               check = factor2;
            ++counter;

            printf(" factor1 is %d\n factor2 is %d\n check is %d\n", 
factor1, factor2, check);
            printf(" perfect is %d\n", perfect);

            }
         }

      }
   }

   if ( (perfect + 1) == number)
      return 1;
   else
      return 0;
}

Does anyone know what the deal is?