CODEWITHSUNDEEP
c++arraysstring
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Reputation: 23

How to split an input string in an integer array(c++)

I'm just started learning c++. In Java, to split an input, you would just to have to use the split method to split the spaces from an input. Is there any other simple way, where you can split a string input in an integer array? I don't care about efficiency; I just want some codes that could help me understand how to split spaces from an input.

An example would be: Input: 1 2 3 4 Code:

int list[4];
list[0]=1;
list[1]=2;
list[2]=3;
list[3]=4;

Upvotes: 0

Views: 547

Answers (2)

Some programmer dude
Some programmer dude

Reputation: 409146

In C++ this can be handles with basically a single function call as well.

For example like this:

std::string input = "1 2 3 4";  // The string we should "split"

std::vector<int> output;  // Vector to contain the results of the "split"

std::istringstream istr(input);  // Temporary string stream to "read" from

std::copy(std::istream_iterator<int>(istr),
          std::istream_iterator<int>(),
          std::back_inserter(output));

References:

If the input is not already in a string, but is to be read directly from standard input std::cin it's even simpler (since you don't need the temporary string stream):

std::vector<int> output;  // Vector to contain the results of the "split"

std::copy(std::istream_iterator<int>(std::cin),
          std::istream_iterator<int>(),
          std::back_inserter(output));

Upvotes: 2

idontseethepoint
idontseethepoint

Reputation: 483

#include <iostream>
#include <array>

int main()
{
  int list[4];
  for (int i=0; i<4; ++i)
  {
     std::cin >> list[i];
  }

  std::cout << "list: " << list[0] << ", " << list[1] << ", " << list[2] << ", " << list[3] << "\n";

  return 0;
}

This will split the input on whitespace and assumes there are at least 4 ints in the input.

Upvotes: 1

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