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();
}