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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.

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c++ issues with cin.fail() in my program

I want to use input y to do saving thing,and r to do resuming, but then i write it in the following codes,and then I input y or r,I just to be noticed ""Please enter two positve numbers" this line code "if(x==（int）('y'))"and next line is ignored.how…
Wallace
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why is my compiler complaining when i try to clear the cin buffer

i am writing a program where i am trying to implement the following code: int main(){ string inputcmd; while (getline(cin, inputcmd)){ cout << "TYPE A COMMAND" << endl; cin >> inputcmd; cin.ignore…
notamathwiz
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Creating a multiple class instances from user input

I was wondering if it was possible to create multiple class instances solely from a user input. For example: Class Person{ int a; int b; } Person 1; Person 2; etc... int number; Then cout << "Ask user to input a number for amount of…
user2860942
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when i call my function the while loop skips a step

this is my code: string getFileContents(istream& file_contents){ string line; getline(file_contents, line); return line; } project read_project(istream& in){ project newproject; while(cin){ cout << "Enter your project name:…
notamathwiz
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Stack around the variable is corrupted

I have what seems like a pretty simple, beginner question that I must be missing something obvious. I am just trying to prompt the user to input a 4 digit number and then take in the input as an array, splitting up the digits to be by themselves. I…
user2921180
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Splitting a String in C++ (using cin)

I'm doing THIS UVa problem, which takes in the following input: This is fun- ny! Mr.P and I've never seen this ice-cream flavour before.Crazy eh? # This is fun- ny! Mr.P and I've never seen this ice-cream flavour before.Crazy eh? # and produces…
muttley91
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program crashes when attempting to set the value of a string issue with cin >>

This is a bizarre error that I have never seen before, and do not know how to fix it. The crash occurs on na = m Here is the relevant code. The line in question is marked with *: In Main: #include #include #include…
user2836315
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How does `cin>>` take three values though they are separated by space?

When looking at some code online I found cin>>arr[0][0]>>arr[0][1]>>arr[0][2] where I put a line of three integer values separated by space. I see that those three integers separated by space become the value of arr[0][0], arr[0][1] and…
Anklon
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Pipe a file of bytes to C++program, via Linux and read byte-by-byte?

Is there a way to pipe a file of (bytes- obviously) in to a C++ application on Linux. However, rather than just use getline() I would like to read each byte only once. For example I don't want to use getline() because it would read all the bytes up…
user997112
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How to read symbols until ESC button is pressed from cin in C++

I need to make my while loop works until ESC button on keyboard is pressed. char choose = NULL; while( choose != 27) { cout << "Choose (s), (e) or (n): "; cin.ignore(); choose = cin.get(); switch(choose){ case 's':…
Heidel
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Issue with cin.peek() and having issues getting correct input

ok so eventually im going to be making a postfix calculator with a stack implementation and getting inputs such as 45 20+. I'm just having trouble with getting the input correct, I want to ignore whitespace, if the user enter a number, i want to cin…
user1940516
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Trouble using cin.peek() and detecting end of input with cin.peek()

1 #include 2 using namespace std; 3 4 #include"dstack.h" 5 6 int main() 7 { 8 char value = cin.peek(); 9 char op; 10 double num; 11 12 while(value != cin.eof()) 13 { 14 if( (isdigit(value) || value == '.') ) 15 { 16 …
user1940516
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Overloading operator>>

I have a Date class which I am trying to test with a simple program to ask the user to input a date in a certain format which will then be put into the class. The idea is to allow the user to set a Date class from any string of text starting with…
KG6ZVP
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create class via input from cin fetched with operator>>

My assignment I to create the following classes with the following data members / member functions. Computer RAM (in GB). Processor Speed (in GHz). # of Cores Hard Drive Storage Size (in GB). Print (Virtual Function) Desktop (inherits from…
Josamoda
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Keep a running C++ program console on top?

Let's say I was using cin in my program to allow the user to input into the console. That is simple enough but what if they were typing into, let's say, a web browser and I wanted them to input that into the console at the same time? When I click…
aanrv
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