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Questions tagged [cin]

std::cin is the global stream object provided by the C++ standard library for reading from the standard input stream.

For more general questions about std::istream use the or tags.

1859 questions
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Checking cin input stream produces an integer

I was typing this and it asks the user to input two integers which will then become variables. From there it will carry out simple operations. How do I get the computer to check if what is entered is an integer or not? And if not, ask the user to…
user2766546
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Can a variable be initialized with an istream on the same line it is declared?

Can the following two lines be condensed into one? int foo; std::cin >> foo;
ayane_m
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How to read cin with whitespace up until a newline character?

I wish to read from cin in C++ from the current position up until a newline character into a string. The characters to be read may include spaces. My first pass fails because it stops on the first space: string result; cin >> result; If cin is…
WilliamKF
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C++ cin char read symbol-by-symbol

I need to read symbol-by-symbol. But I don't know how to read until end of input. As exemple test system will cin>>somecharvariable m times. I have to read symbol-by-symbol all characters. Only m times. How I can do it?
tucnak
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5 answers

difference between cin.get() and cin.getline()

I am new to programming, and I have some questions on get() and getline() functions in C++. My understanding for the two functions: The getline() function reads a whole line, and using the newline character transmitted by the Enter key to mark the…
Yu Zhou
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11 answers

How to signify no more input for string ss in the loop while (cin >> ss)

I used "cin" to read words from input stream, which like int main( ){ string word; while (cin >> word){ //do sth on the input word } // perform some other operations } The code structure is something like the above one.…
user630983
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14
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Difference between cin and cin.get() for char array

I have these 2 codes: char a[256]; cin>>a; cout<
Ruben P
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14
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cin >> "no operator matches these operands"

I've been working on a C++ project in visual studio 2012 console mode and I keep getting this strange persistent error with the cin function. Under the >> I get a red line and the program tells me no operator matches these operands. I have…
user3163612
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8 answers

How to check if a string is in a list of strings?

In Python, doing if a in b is really easy, and I'm wondering if there's an equivalent in C++. Specifically, I want to make a list of strings and check if an input is in that list. std::string myinput; std::string mylist[] = {"a", "b", "c"}; std::cin…
Sumyjkl
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c++, how to verify is the data input is of the correct datatype

Possible Duplicate: how do I validate user input as a double in C++? I am new to C++, and I have a function in which I am wanting the user to input a double value. How would I go about insuring that the value input was of the correct datatype?…
Brook Julias
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2 answers

Getting arrow keys from cin

I am sure this must have been asked before, but a quick search found nothing. How can I get the arrow/direction keys with cin in c++?
Baruch
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13
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5 answers

C++ having cin read a return character

I was wondering how to use cin so that if the user does not enter in any value and just pushes ENTER that cin will recognize this as valid input.
Tomek
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2 answers

cin and boolean input

I am new to C++ and I was wondering how the function cin in case of a boolean data works. Let's say for instance : bool a; cin >> a; I understand that if I give 0 or 1, my data a will be either true or false. But what happens if I give another…
Xema
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Is it possible to use cin with Qt?

Is it possible to use cin in Qt? I can use cout but cannot find examples of how to use cin within a Qt console application.
grant
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Why getline() skipping input, even after cin.clear()?

So I have a function that keeps skipping over the first getline and straight to the second one. I tried to clear the buffer but still no luck, what's going on? void getData(char* strA, char* strB) { cout << "Enter String 1: "; //…
Derp
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