#include <iostream>
#include <cmath>
void simon(int); // 函数头,void表示该函数无返回值
void plus5(double);
int userplus(double,double);
int main()
{
using namespace std;
cout << "simon函数是将n值*5的简单函数 "<<endl;
cout << "simon函数默认值为5 " << endl << "输出结果为:";
simon(3); // 调用simon()函数
cout << "定义新的simon函数值:";
int count;
cin >> count;
cout << "输出结果为:" << endl;
simon(count); // 再次调用已定义的新函数simon
cout << "程序结束!" << endl;
cout << "开始第二节程序-加法函数plus5:" << endl;
double x;
cout << "请赋值x:";
cin >> x;
plus5(x);
cout << "第三节,自定义乘法函数:" << endl;
double a; double b;
cout << "请赋值因数a:";
cin >> a;
cout << "请赋值因数b:";
cin >> b;
double plusreturn;
plusreturn = userplus(a, b);
cout << "输出:" << plusreturn << endl;
system("pause");
return 0;
}
void simon(int n) // 定义新函数simon
{
using namespace std;
cout << "Simon says touch your toes " << n*5 << " 值." << endl;
} // void函数不需要return提供返回值
void plus5(double n)//定义+5函数
{
using namespace std;
cout << "加法函数运行后所得值:" << n + 5<<endl;
}
int userplus(double a,double b)
{
using namespace std;
double y;
y = a*b;
return y;
}
练习构建基本函数,正确书写函数头(void、int…),simon函数、plus5函数及userplus函数均为自定义函数。