CODEWITHSUNDEEP
c++user-inputiostream
rasul1719435
rasul1719435

Reputation: 115

Why must type getline(cin, string) twice?

need your help in getting user inputs.
I want users to type a string that has spaces. i cant use cin>>variable as the space in between makes the problem go wrongly. if i use getline(cin,string_variable) it works correctly. but i need to type twice in order to make it work proberly.

cout<<"Enter movie name";
getline(cin, mvName);
getline(cin, mvName);

Is there a better way to get user input than this or is there any other codes to type rather than typing the getline twice? Pls advice.

Upvotes: 2

Views: 7108

Answers (5)

Rohit Vipin Mathews
Rohit Vipin Mathews

Reputation: 11787

cout<<"Enter movie name";
  getline(cin, mvName);

Works fine!

Maybe you had to use getline(cin, mvName); twice was because you inputted some character into the first getline(cin, mvName); like Space, Enter, etc.

Upvotes: 0

Dietmar K&#252;hl
Dietmar K&#252;hl

Reputation: 153905

When switching between formatted input using in >> value and unformatted input, e.g., using std::getline(in, value) you need to make sure that you have consumed any whitespace you are not interest in. In you case there is probably a newline in the buffer from a prior input. Assuming you are nit interested in leading whitespace the easiest approach is to use something like this:

if (std::getline(std::cin >> std::ws, mvName)) {
    process(mvName);
}

BTW, you should always check that your input was successful.

Upvotes: 7

hmjd
hmjd

Reputation: 121981

As the question contains no new-line character I suspect you hit enter to move down from the "Enter movie name" question? This would put a blank line into stdin, which the first getline() would read and then second getline() would read your entered text.

To remove the requirement of typing the initial new-line character just add it to the question's string literal:

std::cout<< "Enter movie name:\n";

Upvotes: 1

PiotrNycz
PiotrNycz

Reputation: 24412

Maybe you just forget to add \n in your prompt message:

cout<<"Enter movie name:\n";

But if you want skip empty lines - do this:

// skip empty lines
while (cin >> mvName && mvName.empty());
// here mvName contains non empty string or it is empty because of error in reading
....

Upvotes: 1

M4rc
M4rc

Reputation: 503

I had no issues using:

char mvName[32];

cin.getline(mvName, 32);

And I only had to call it once, again with no issues.

Upvotes: 2

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