Why am I getting an missing ')' identifier error in the following code?

I'm trying to write a program that counts the number of perfect numbers within a limit, but the compiler keeps on giving me the "missing ')' before identifier 'num_squares'" error. Please help...

int main(void) {
 int num_squares = 0;
 int limit = 30;
 while(num_squares * num_squares < limit)
  num_squares++;

 printf("%d," num_squares);

}

From stackoverflow

• Don't know about that part of the code, but you're missing a comma in your printf

  printf("%d," num_squares);
  

  should be

  printf("%d,", num_squares);
  

• You put comma inside ""-quotes in printf("%d," .

  also please format your code.

• use , after double qoutes in printf

• This:

  printf("%d," num_squares);
  

  Should be:

  printf("%d", num_squares);