1、编写一个C++程序，输入一个正整数，判断其是否为素数
#include<iostream>
using namespace std;
const int MAX=100000;
bool is_prime[MAX];int main()
{int n;cin>>n;for(int i=2;i<=n;i++)is_prime[i]=1;for(int i=2;i*i<=n;i++){if(is_prime[i]){for(int j=i*i;j<=n;j+=i)is_prime[j]=0;}}if(is_prime[n])cout<<n<<" is prime"<<endl;else cout<<n<<" is not a prime"<<endl;}
2、编写一个C++程序，用重载解决不同类型的两个敬的最小值问
题，不同类型有double ，long, char，int).
#include<iostream>
using namespace std;double compare(double a,double b)
{if(a<b)return a;else if(a==b)return a;
}
long compare(long a,long b)
{if(a<b)return a;else if(a==b)return a;
}int compare(int a,int b)
{if(a<b)return a;else if(a==b)return a;
}char compare(char a,char b)
{if(a<b)return a;else if(a==b)return a;
}int main()
{cout<<compare(1.1,2.2)<<endl;cout<<compare(3,6)<<endl;cout<<compare('a','b')<<endl;}
3、定义一个Teacher(教师)类，在该类定义中包括数据成员: Name
《姓名)Sex (性别)、Salary(工资)和Reward(奖企):成员丽数:构造函效leacher, 设置姓名、性别、工成和奖金四个初始数据:用函效money计算并输出教师的总钱数。在main函数中，要求创建对家，并输出某个教师的总银数
#include<iostream>
#include<string>
using namespace std;class Teacher{string name;bool sex;double salary;double reward;
public:Teacher(string _name,bool _sex,double _salary,double _reward):name(_name),sex(_sex),salary(_salary),reward(_reward){}double money(){cout<<"name:"<<name<<" "<<reward+salary<<endl;}
};int main()
{Teacher Tom("Tom",1,400,500.6);Tom.money();Teacher jack("jack",0,600,400.88);jack.money();
}
4定义复数类，以成员函数形式重就运算符“+”加法，
并输出一个复数。
#include <iostream>
using namespace std;class Plural {private:int a; // 实部 int b;public:Plural(int A, int B) {a = A;b = B;}Plural() {}Plural operator+ (const Plural p) const {Plural new_p;new_p.a = a + p.a;new_p.b = b + p.b;return new_p;}void show() {cout << a << " + " << b <<" i"<< endl;}
};int main() {Plural p1(3, 2);Plural p2(4, 6);Plural p3 = p1 + p2;p3.show();return 0;
}
5、是义一个shape抽象类，包含品度和宽奥两个数据成员，由此派生
出Rectangle类和Circle大,写土主程序，用来求高度和宽度分别为2.3和36的矩形，以及半径为2.5的因的面积，要求通过使用基类指针访问虚压效的方法来求矩形和因的面积Area.
#include<iostream>
using namespace std;class shape{
protected:double width,high;
public:shape(double a,double b):width(a),high(b){}shape(){}virtual void Area()=0;
};class Rectangle:public shape{
public:Rectangle(double w,double h):shape(w,h){};void Area(){cout<<"Area of rectangle is "<<width*high<<endl;}
};class Circle:public shape{double r;
public:Circle(double _r):r(_r){}void Area(){cout<<"Area of circle is "<<3.14*r*r<<endl;}
};
int main()
{shape* obj;Rectangle a1(2.3,3.6);obj=&a1;obj->Area();Circle a2(2.5);obj=&a2;obj->Area();
}
