What does endl mean in c++

endl is a standard library function in C that is used to insert a newline character into the output stream. The specific purpose is as follows: insert a newline character to indicate the beginning of a new line. Used with the << operator to insert a newline character into the output stream. Like '\n', but flushes the stream, immediately displaying output on the console. Is a stream caret that can be used with other stream carets.

endl in C

endl is a standard library function in C, which means "end of line" (line tail). It is a stream insertion character used to insert a newline character into the output stream.

Purpose

endl is used to indicate the beginning of a new line in the output stream. It is often used with the << operator to insert newlines into the output stream. For example:

<code class="cpp">std::cout << "Hello" << endl;</code>

This will output "Hello" and place it on a new line in the output stream.

Differences from '\n'

endl is very similar to '\n' (newline escape character), but there are subtle differences between the two:

• endl Flushes the stream after inserting a newline character into the output stream. This makes it possible to see the output on the console immediately, without '\n' flushing the stream.
• endl is a stream caret and '\n' is a character. This means that endl can be used with other carets, such as <<, but '\n' cannot.

Example usage

The following are some example usages of endl:

<code class="cpp">// 输出 "Hello" 并换行
std::cout << "Hello" << endl;

// 输出文件 "output.txt" 中的文本
std::ofstream output("output.txt");
output << "Hello" << endl;</code>

Summary

endl is a standard library function in C that inserts a newline character into the output stream. It enables output to be seen immediately on the console and can be used with other stream carets.

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