Using getline in C

Question

I have a problem using getline method to get a message that user types  I m using something like   string messageVar  cout  lt  lt   Type your message     getline cin  messageVar     However  it s not stopping to get the output value  what s wrong with this

User · Answer

If you only have a single newline in the input, just doing

std::cin.ignore();

will work fine. It reads and discards the next character from the input.

But if you have anything else still in the input, besides the newline (for example, you read one word but the user entered two words), then you have to do

std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

See e.g. this reference of the ignore function.

To be even more safe, do the second alternative above in a loop until gcount returns zero.

User · Answer

The code is correct  The problem must lie somewhere else  Try the minimalistic example from the std  getline documentation   main          std  string name       std  cout  lt  lt   Please  enter your full name         std  getline  std  cin name       std  cout  lt  lt   Hello     lt  lt  name  lt  lt     n        return 0

User · Answer

int main         example with file        input is a file     if input is open             cin ignore 1   n      it ignores everything after new line         cin getline buffer 255      save it in buffer         input lt  lt buffer    save it in input it s a file          input close

User · Answer

I know I m late but I hope this is useful  Logic is for taking one line at a time if the user wants to enter many lines int main       int t                        no of lines user wants to enter cin gt  gt t  string str  cin ignore                  for clearing newline in cin while t--        getline cin str         accepting one line  getline is teminated when newline is found      cout lt  lt str lt  lt endl     return 0       input   3 Government collage Berhampore Serampore textile collage Berhampore Serampore output   Government collage Berhampore Serampore textile collage Berhampore Serampore

User · Answer

If you re using getline   after cin  gt  gt  something  you need to flush the newline character out of the buffer in between  You can do it by using cin ignore     It would be something like this   string messageVar  cout  lt  lt   Type your message     cin ignore     getline cin  messageVar     This happens because the  gt  gt  operator leaves a newline  n character in the input buffer  This may become a problem when you do unformatted input  like getline    which reads input until a newline character is found  This happening  it will stop reading immediately  because of that  n that was left hanging there in your previous operation

User · Answer

i think you are not pausing the program before it ended so the output you are putting after getting the inpus is not seeing on the screen right   do   getchar      before the end of the program

User · Answer

I had similar problems   The one downside is that with cin ignore    you have to press enter 1 more time  which messes with the program

[c++] Using getline() in C++

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