> For the complete documentation index, see [llms.txt](https://peiyafei.gitbook.io/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://peiyafei.gitbook.io/c/1.6-han-shu/6.5-han-shu-de-chang-jian-yang-shi.md).

# 6.5 函数的常见样式

常见的函数样式有4种

1. 无参无返
2. 有参无返
3. 无参有返
4. 有参有返

**示例：**

```
//函数常见样式
//1、 无参无返
void test01()
{
	//void a = 10; //无类型不可以创建变量,原因无法分配内存
	cout << "this is test01" << endl;
	//test01(); 函数调用
}

//2、 有参无返
void test02(int a)
{
	cout << "this is test02" << endl;
	cout << "a = " << a << endl;
}

//3、无参有返
int test03()
{
	cout << "this is test03 " << endl;
	return 10;
}

//4、有参有返
int test04(int a, int b)
{
	cout << "this is test04 " << endl;
	int sum = a + b;
	return sum;
}
```