convert string to int

I have this program where the user can enter commands, followed by either a string, or int, depends on which command asks for.

so i store the input all into one string, then cut it into two strings command and input

is there a simple way to convert a string of numbers into integers?

Code:

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

int main()
{
    std::string str = "123 456 789";
    std::stringstream sstr(str);
    int number;

    while( sstr >> number )
        std::cout << number << std::endl;

    return 0;
}

Output:

Code:

123
456
789

thanks, worked perfectly