c++实验2

#include<iostream>
using namespace std;
int main()
{
	char x;
	cout<<"Meau:A(dd) D(elete) S(ort) Q(uit),Select one:"<<endl;
	while(true)
	{
		cin>>x;
		if(x=='Q')
	break;
    if(x=='A')
	{
	cout<<"数据已经增加"<<endl;continue;
}
	else if(x=='D')
	{
	cout<<"数据已经删除"<<endl;continue;
}
	else if(x=='S')
	{
	cout<<"数据已经排序"<<endl;continue;
	}
}
	

return 0;
} 

　　

#include<iostream> 
using namespace std;
int main()
{
	char x;
	cout<<"Meau:A(dd) D(elete) S(ort) Q(uit),Select one:"<<endl;
	while(true)
	{
		cin>>x;
		switch(x)
		{
			case 'A':cout<<"数据已经增加"<<endl;continue;
			case 'D':cout<<"数据已经删除"<<endl;continue;
			case 'S':cout<<"数据已经排序"<<endl;continue;
			case 'Q':break;
		}
		
	}
	return 0;
}

　　

#include<iostream>
using namespace std;
int main()
{
	int i,n;
	for(i=2;i<=100;i++)
	{
		for(n=2;n<i;n++)
		{
			if(i%n==0)
			break;
		}
		if(i==n)
		cout<<i<<endl; 
	}

	return 0;
} 

　　

#include<iostream>
using namespace std;
int main()
{
	int i=2;
	while(i<=100)
	{
		int n=2;
		while(n<i)
		{ 
		if(i%n!=0)
		++n;
		else
		break;
	    }
	    if(i==n)
	    cout<<i<<endl;
	    i++;
	}
	return 0;
}
 

　　

#include<iostream>
#include<cstdlib>
using namespace std;
int sj()
{
    int sj=rand()%101;
    return sj;
}
int main()
{
    unsigned seed;
    int n,js;
    cout<<"输入种子"<<endl;
    cin>>seed;
    while(true)
    {
    srand(seed);
    js=sj();
    cout<<"输入猜的数"<<endl;
    cin>>n;
    if(n!=js)
    {
        cout<<js<<endl<<"再猜一次"<<endl;
        seed=js;
        continue;
    }
    else
    cout<<"你猜对了"<<endl;
    break;
    }
return 0;     
}

#include<iostream>
using namespace std;
int main()
{
	int t;
	for(int i=1;i<=5;i++)/*剩下一个球*/ 
	{
	for(int m=1;m<=4;m++)/*剩下第二个球*/
	 t++;
    }
cout<<"共有"<<t/2<<"种方法"; /*有一遍重复*/ 
return 0;
}