What does do while mean in c language?

The do while statement checks the condition after executing the code block first, and does not stop execution until the condition is false. 1) Execute the code block; 2) Check the condition; 3) Continue to execute the code block if the condition is true, and jump out of the loop if the condition is false. The difference from the while statement is that the do while loop executes the code block at least once, while the while statement may not execute.

do while statement

do while statement is a loop statement that starts with The code block is executed first, then the condition is checked for pattern, and the code block is executed until the condition is false.

Syntax

<code class="c">do {
  // 代码块
} while (条件);</code>

How it works

The do while statement first executes the code block. Then, it checks whether the condition is true. If true, it continues executing the block of code; if false, it breaks out of the loop.

Example

<code class="c">int i = 0;

do {
  printf("%d\n", i);
  i++;
} while (i < 5);</code>

This code will print numbers from 0 to 4 because even though the initial value of i is 0 (condition is false) , it will also execute the code block once. The difference between

and while statement

do while statement and while statement are: do while A statement always executes a block of code at least once, while a while statement may not execute a block of code at all.

Advantages

The advantages of the do while statement are:

• Ensure that the code block is executed at least once.
• Applicable to situations where loop variables need to be initialized.

Disadvantages

The disadvantages of the do while statement are:

• may lead to code duplication because The code block will always execute before the condition becomes false.
• may mask logic errors because the loop will execute until the condition is false.

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