Convert String containing several numbers into integers

Question

I assume you want to read an entire line, and parse that as input. So, first grab the line:

std::string input;
std::getline(std::cin, input);

Now put that in a stringstream:

std::stringstream stream(input);

and parse

while(1) {
   int n;
   stream >> n;
   if(!stream)
      break;
   std::cout << "Found integer: " << n << "\n";
}

Remember to include

#include <string>
#include <sstream>

The C++ String Toolkit Library (Strtk) has the following solution to your problem:

#include <iostream>
#include <string>
#include <deque>
#include <algorithm>
#include <iterator>

#include "strtk.hpp"

int main()
{
   std::string s = "1 23 456 7890";

   std::deque<int> int_list;
   strtk::parse(s," ",int_list);

   std::copy(int_list.begin(),
             int_list.end(),
             std::ostream_iterator<int>(std::cout,"\t"));

   return 0;
}

More examples can be found Here

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

int main() {
   std::string input;
   while ( std::getline( std::cin, input ) )
   {
      std::vector<int> inputs;
      std::istringstream in( input );
      std::copy( std::istream_iterator<int>( in ), std::istream_iterator<int>(),
         std::back_inserter( inputs ) );

      // Log process: 
      std::cout << "Read " << inputs.size() << " integers from string '" 
         << input << "'" << std::endl;
      std::cout << "\tvalues: ";
      std::copy( inputs.begin(), inputs.end(), 
         std::ostream_iterator<int>( std::cout, " " ) );
      std::cout << std::endl;
   }
 }

#include <string>
#include <vector>
#include <sstream>
#include <iostream>
using namespace std;

int ReadNumbers( const string & s, vector <int> & v ) {
    istringstream is( s );
    int n;
    while( is >> n ) {
        v.push_back( n );
    }
    return v.size();
}

int main() {
    string s;
    vector <int> v;
    getline( cin, s );
    ReadNumbers( s, v );
    for ( int i = 0; i < v.size(); i++ ) {
        cout << "number is " <<  v[i] << endl;
    }
}

// get string
std::string input_str;
std::getline( std::cin, input_str );

// convert to a stream
std::stringstream in( input_str );

// convert to vector of ints
std::vector<int> ints;
copy( std::istream_iterator<int, char>(in), std::istream_iterator<int, char>(), back_inserter( ints ) );

Here is how to split your string into strings along the spaces. Then you can process them one-by-one.