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Include the iostream Header

Using cin to Read Input

Reading Multiple Values

Getting String Input with Spaces

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C語言如何獲取用戶輸入

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Oct 16, 2025 pm 12:10 PM

使用cin需包含頭文件并引入std命名空間；2. 通過>>操作符從鍵盤讀取輸入，如cin >> age可獲取整數(shù)，連續(xù)輸入用多個>>操作符實現(xiàn)。

How to get user input in C

To get user input in C , you use the cin object from the iostream library. It reads data from the standard input (usually the keyboard) and stores it in variables.

Include the iostream Header

Before using cin, make sure to include the header at the top of your program:

#include

You’ll also typically use the std namespace to avoid writing std:: before every object:

using namespace std;

Using cin to Read Input

The cin object uses the extraction operator >> to read input. Here’s a basic example that gets an integer from the user:

int age;
cout cin >> age;
cout

This works similarly for other data types like float, double, or char.

Reading Multiple Values

You can read multiple inputs in one line. For example:

int a, b;
cout cin >> a >> b;
cout

The user can type both numbers separated by a space or press Enter between them.

Getting String Input with Spaces

If you want to read a full line of text (including spaces), use getline() instead of cin:

string name;
cout getline(cin, name);
cout

cin stops reading at whitespace, so getline() is better for names or sentences.

Basically, use cin for single values and getline() when you need entire lines. Make sure to include the right headers and handle input carefully to avoid errors.

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