How to seperate integers from input string and convert them to type int to allow calculations on them

Question

As Mehdi Algholipour wrote i wanted to

1.Get string from input

2.Separate input to Integer numbers

3.Save them into Array

    cout << "Give me some integers separated with space";

    cin >> string;     // example input 10 210 300 510


    //..some code that seperate input to integer numbers and save them to Array


    //EXPECTED RESULT: Array[0]=10 Array[1]=210 etc...

Answer 1

Try:

#include <iostream>
#include <string>
#include <vector>
#include <regex>

int main()
{
    std::regex rgx("\\b\\d+\\b");

    std::string line;

    std::cout << "Please enter numbers separated by spaces and press enter:" << std::endl;

    std::getline(std::cin, line);

    std::sregex_iterator it(line.begin(), line.end(), rgx);
    std::sregex_iterator end;

    std::vector<int> values;
    std::transform(it, end, std::back_inserter(values), [](std::smatch s){ return std::stoi(s.str()); });

    for (int v : values)
        std::cout << v << std::endl;

}

Answer 2

I think your mean is:

1. Get string from input
2. Separate input to Integer numbers
3. Save them into Array

If this is your mean, try this code:

string str;
int arr[1000];  // I supposed 1000 is your Int Array size.
int number = 0, index = 0;

getline(cin, str);  // Get a line of string

for (int i = 0 ; i < str.length() ; i++){   // Processing your str Array
    if (isdigit(str[i])){
        number *= 10;
        number += ((int)str[i] - '0');
    }
    else {
        arr[index++] = number;
        number = 0;
    }
}
arr[index] = number;    // for last element of your input

// Do something you want

Answer 3

Use stringstream:

string str;
getline(cin, str);

stringstream ss(str);
vector<int> vec;

int Integer;
while(true)
{
    ss >> Integer;
    if(!ss)
        break;

    vec.push_back(Integer);
}

live demo

Note: You need to include following headers: <string>, <sstream>, <vector>