How to use cin in c++

cin is a stream object in C used to read data from standard input. Usage: 1. Include the header file #include ; 2. Declare the cin object std::cin; 3. Use the >> operator to read the input; 4. Press the Enter key to submit the input, and the input will be stored in in the specified variable.

Using cin in C

What is Cin?

cin is a stream object in the C standard library used to read data from standard input (usually the keyboard).

Usage:

1. Include the header file

<code class="cpp">#include <iostream></code>

2. Declare the cin object

<code class="cpp">std::cin; // 声明 cin 对象</code>

3. Use the >> operator to read the input

<code class="cpp">int num;
std::cin >> num;</code>

4. Press Enter to submit the input

After pressing the Enter key, the input will be read from the standard input and stored in the specified variable.

For example:

<code class="cpp">int main() {
  int num;
  std::cout << "Enter a number: ";
  std::cin >> num;
  std::cout << "The number is: " << num << std::endl;
  return 0;
}</code>

Note:

• cin only accepts space-delimited input.
• If the user enters invalid data, cin will throw an exception.
  *Wrong characters in the input can be skipped using the std::cin.ignore() function.

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