How to input integer in c++ without using ">>"

Question

My Question/Problem:
Right now my program is using cin >> to get input and thats working fine except for I need to use getline() at one point and I know I shouldn't mix things like getline() and cin.get() with cin >>. How do I input an integer without using >>?

Research:
I've tried to research this, but every result I find says to use cin >> This is the closest I've found.

I would be just as happy to find a way to avoid using getline().

It's quite possible to mix `cin >>` with `getline()` if you just [compensate for the newline problem](http://stackoverflow.com/a/10553849/597607). — Bo Persson, Oct 12 '16 at 07:29

score 5 · Answer 1 · answered Oct 12 '16 at 07:21

5

There are a couple of ways:

One way is to use std::getline to read the line into a std::string, and put that string into a std::istringstream where you can use the input operator >>.
Another way, if the input is only the number, is to use std::getline to get the line, then convert it to a number using std::stoi.

answered Oct 12 '16 at 07:21

Some programmer dude

400,186
35
402
621

The first option looks like what I'm looking for, but I'm confused about how to do it. Especially with using namespace std. This is what I've tried: `getline(cin,firstMiddleName); istringstream iss(firstMiddleName); iss >> firstMiddleName;` – StarSweeper Oct 12 '16 at 07:41
@StarSweeper That looks fine, what problems do you have with it? – Some programmer dude Oct 12 '16 at 07:48
iss gives the error incomplete type not allowed. I've never used istringstream before, I'm sure I'm missing a line or something. – StarSweeper Oct 12 '16 at 07:49
Yup. I needed #include this works, thank you! – StarSweeper Oct 12 '16 at 07:51
@StarSweeper Follow the link in my answer, it will tell you what header file you need. – Some programmer dude Oct 12 '16 at 07:51
This answer turned out not to work, but I'll leave it as accepted in case it works for someone else. Using @Bo Persson's answer in the comments ended up working. – StarSweeper Oct 12 '16 at 08:13
@StarSweeper If the answer doesn't solve your problem then you should not leave it as accepted. Remove it, it's okay. Just leave a comment about why for others. – Some programmer dude Oct 12 '16 at 08:18
This answer has the same issue as using mixing getline and >>, it skips the next input. This link has a good fix: http://stackoverflow.com/questions/10553597/cin-and-getline-skipping-input/10553849#10553849 – StarSweeper Oct 12 '16 at 08:24

How to input integer in c++ without using ">>"

1 Answers1