How Can I Easily Extract Numbers from a Comma-Delimited String in C ?

Easy Extraction of Numbers from Comma-Delimited Strings in C

Parsing a string containing a comma-separated list of numbers into an integer array is a straightforward task in C . To accomplish this, consider the following technique:

Iterate through the string character by character:

• Input each number.
• If the character following the number is a comma, discard it.

Code Implementation:

#include <vector>
#include <string>
#include <sstream>
#include <iostream>

int main() {
  std::string str = "1,2,3,4,5,6";
  std::vector<int> vect;

  std::stringstream ss(str);

  for (int i; ss >> i;) {
    vect.push_back(i);
    if (ss.peek() == ',')
      ss.ignore();
  }

  for (std::size_t i = 0; i < vect.size(); i++)
    std::cout << vect[i] << std::endl;
}

Output:

1
2
3
4
5
6

This code successfully parses the comma-delimited string into an integer array, storing the individual numbers in the vector vect. The std::stringstream makes it easy to extract the numbers and check for the presence of commas.

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