While your question states that you wish to
get a string using getline and checks it for an int
using stringstream
, it's worth noting that you don't need stringstream
at all. You only use stringstreams when you want to do parsing and rudimentary string conversions.
A better idea would be to use functions defined by std::string
to find if the string contains numbers as follows:
#include <iostream>
#include <string>
int main() {
std::string input = "a b c 4 e 9879";//I added some more extra characters to prove my point.
std::string numbers = "0123456789";
std::size_t found = input.find_first_of(numbers.c_str());
while (found != std::string::npos) {
std::cout << found << std::endl;
found = input.find_first_of(numbers.c_str(), found+1);
}
return 0;
}
And then perform the conversions.
Why use this? Think about happens if you use a stringstream object on something like the following:
"abcdef123ghij"
which will simply be parsed and stored as a regular string.