Thread: Function for chek if letter exist

Hi ,I wrote this functiont to check for abanded characters ,but it doesnt work
I need help
Thanks
The errors are missing terminating characters

Code:

int checkout(char letter)
{
  char forbiden[20]={'{','}','[',']','(',')','0','1','2','3','4','5','6','7','8','9','+,'-','*','/'};
  int i;
  int numErrors=0;
  for(i=0;i<20;i++)
  {
    if(forbiden[i]!=letter);
    numErrors++;
  }
  return numErrors;
}