CODEWITHSUNDEEP
c
Cooldog117
Cooldog117

Reputation: 85

ignore chars between 2 chars

Im looking through a file. if I run into a '#' I want to ignore everything until I get to '\n' . my current logic is not working.

Im trying to strip comments from the file I think the problem has something to do with my logic in the second while loop

int wishforint(FILE *in)
{
char c;
int d;
int i=0;
int smarr[5];

while(i<5)
{
   fscanf(in, "%c", &c);
   printf("c is %c\n",c);

   if(isdigit(c))
   {
      ungetc(c, in);
      fscanf(in, "%d", &d);
/*add this later. 
return d;
*/
      smarr[i]=d;
      printf("smarr[%d]= %d\n",i,d);
      i++;
   }
   else if(c=='#')
   {
      while(fscanf(in,"%c",&c) != EOF && c != '\n')
      {}
      break;
   }
}


   printf("Width is = %d\n", smarr[1]);
   printf("Height is= %d\n", smarr[2]);
   printf("Max value= %d\n", smarr[3]);

   return 7;
}

Upvotes: 0

Views: 153

Answers (3)

Alexander Sannikov
Alexander Sannikov

Reputation: 103

May be usage of sscanf and fgets will be more easy?

Probably something like this:

while (fgets(buf, BUF_LENGTH, in) != NULL){
    errno=0;
    if ((sscanf(buf, "%d", &d) == 0) && (errno == 0)){
      //we have a comment
      continue;
    }else if(errno != 0){
      //error handling
    }
    //we have a value
    smarr[i]=d;
    i++;
}

It should works well with one-value-in-column file. Where comments starts from begin of new line or after value.

Can you show example of input data?

Upvotes: 0

Okken
Okken

Reputation: 2796

Two problems with the code.

First fscanf does not check for EOF. Fix:


    //fscanf(in, "%c", &c);
    if (fscanf(in, "%c", &c) == EOF) { break; }

Secondly, there ought not to be a 'break' in the '#' clause:


    else if(c=='#')
    {
      while(fscanf(in,"%c",&c) != EOF && c != '\n')
      {}
      //break;
    }

Upvotes: 1

VeeArr
VeeArr

Reputation: 6178

'#' is not a digit, so you are probably hitting the continue before making it to the else if.

Upvotes: 4

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