CODEWITHSUNDEEP
cstring
Ryan
Ryan

Reputation: 311

Does space equal '\0' in C? How can I avoid confusing them?

I am writing a function that looks for the first 4 whole numbers separated by a comma in a string.

For example, if the string is:

123,4,9.5,av4,3,g1,1,6

the function will extract to a different array the numbers: 123,4,3,1

Everything works well until I try entering an input with a space in the middle, which is not supposed to be considered as a valid number, but then the loop stops once it bumps into the space. Is there a solution for that?

I'm not allowed to use any other library than stdio.h.

Here's my code:

int getParameters(int parameters[], int size) {
  char input[100];
  int indexInput = 0, indexParameters = 0;
  int skip = 0, numberSeen = 0, negativeSeen = 0;
  int i = 0;
  scanf("%s", input);

  for ( ; input[indexInput]!= '\0' && indexParameters < size; ++indexInput) {
    if (input[indexInput] == ',' && skip == 1) {
      parameters[indexParameters] = 0;
      skip = 0;
      negativeSeen = 0;
    } else if (input[indexInput] == ',' && negativeSeen == 1 && numberSeen == 1) {
      printf(ERROR);
      return -1;
    } else if (input[indexInput] == ','&& numberSeen == 1) {
      numberSeen = 0;
      indexParameters++;
    } else if (input[indexInput] == ',') {
      continue;
    } else if (input[indexInput] == '-' && skip == 1) {
      continue;
    } else if (input[indexInput] == '-' && numberSeen == 0 && input[indexInput+1] != '-') {
      negativeSeen = 1;
    } else if (input[indexInput] <= '9' && input[indexInput] >= '0') {
      parameters[indexParameters] *= 10;
      parameters[indexParameters] += input[indexInput] - '0';
      numberSeen = 1;
    } else {
      skip = 1;
    }
  }

  if (skip == 1)
    parameters[indexParameters] = 0;
  while (i < 4) {
    printf("%d,", parameters[i]);
    ++i;
  }
  return 0;
}

Upvotes: 2

Views: 1463

Answers (1)

Karoly Horvath
Karoly Horvath

Reputation: 96258

The name of the %s format specifier is a bit misleading, it matches a sequence of non-whitespace characters. As you can see it's meant to read a word, not the whole string.

Perhaps you want to read a whole line?

Upvotes: 5

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