What does c++ use to distinguish code blocks?

How to distinguish code blocks in C

In C, use curly braces {} to distinguish code blocks. Curly braces enclose code, define a logical block, and control the scope of statements within the block.

The role of code blocks

• Organize code into meaningful groups
• Control the scope of statements to ensure that variables can only be Access within specific code blocks
• Allows the creation of nested code blocks, allowing for complex code structures

Use curly braces to define code blocks

Cure braces always appear in pairs, for example:

<code class="c++">{
    // 代码块内的语句
}</code>

The statements within a code block are only valid for this block. Once you leave the code block, these statements are no longer visible.

Nested Code Blocks

C allows the creation of nested code blocks, that is, one code block contained within another code block. This makes code organization clearer and allows the creation of more complex control flows.

For example:

<code class="c++">{
    // 外部代码块
    {
        // 嵌套代码块
    }
}</code>

Statements in nested code blocks can only be accessed within the nested block. Once you leave the nested block, these statements are no longer visible.

Example

The following code demonstrates how to use curly braces to differentiate blocks of code:

<code class="c++">int main()
{
    {
        int x = 5;
        std::cout << "x inside the inner block: " << x << std::endl;
    }

    // 离开内部块后，x 不再可见
    std::cout << "x outside the inner block: " << x << std::endl;

    return 0;
}</code>

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