函数的常见样式

#include <iostream>
using namespace std;
//1、无参无返
void test01()
{
       cout << "this is test01" << endl;
       
}
int main()
{
       //无参无返函数调用
       test01();
        return 0;
}

#include <iostream>
using namespace std;

//2、有参无返
void test02(int a)
{
       cout << "this is test02 a=" << a << endl;
}
int main()
{
       
       //有参无返函数调用
       test02(100);
        return 0;
}

#include <iostream>
using namespace std;
//3、无参有返
int test03()
{
       cout << "this is test03" << endl;
       return 1000;
}
int main()
{
       //无参有返函数调用
       int num1=test03();
       cout << "num1=" << num1 << endl;
        return 0;
}

#include <iostream>
using namespace std;
//4、有参有返
int test04(int a)
{
       cout << "this is test04 a=" << a << endl;
       return 10000;
}
int main()
{
       //有参有返函数调用
       int num2 = test04(10000);
       cout << "num2=" << num2 << endl;
        return 0;
}

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