Extract numbers from string

Question

how do i get and store two numbers from a string using istringstream

For eg.

sum from 2 to 3

i want to read and store 2 and 3 not necessarily we know the position of integers occuring

Answer 1

You can read input using std::cin , for example. If you know your next token is a string, give it a string:

std::string str;
std::cin >> str;

Or an int:

int num;
std::cin >> num;

You should check for eof and error states as usual.