代码

#include <iostream>
using namespace std;
#include <string>

//函数的的常见延时
//1、无参无反
void test01()
{
	cout << "this is test01" << endl;
}
//2、有参无反
void test02(int a)
{
	cout << "this is test02 a = "<<a << endl;
}
//3、无参有反
int test03()
{
	cout << "this is test03" << endl;
	return 30;
}

//4、有参有反
int test04(int a)
{
	cout << "this is test04 a = "<<a << endl;
	return a;
}


int main()
{
	test01();

	test02(10);

	int num1 = test03();
	cout << "num1 = " << num1 << endl;

	int num2 = test04(4);
	cout << "num2 = " << num2 << endl;
	
	system("pause");

	return 0;
}