第二章实验

#include<iostream>
using namespace std;
int main(){
    char x;
    int i;
    cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:";
    for(;i=1;i++){
        cin>>x;
        if(x=='A'){
            cout<<"数据已增加"<<endl;
            cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:";
            continue;
        }
         
        else if(x=='D'){
            cout<<"数据已删除"<<endl;
            cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:";
            continue;
        }
         
        else if(x=='S'){
            cout<<"数据已排序"<<endl;
            cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:";
            continue;
        }
        else if (x=='Q')
              break;
        
    }
    
    return 0; 
} 

#include<iostream>
using namespace std;

int main(){
    char n;
    cout<<"Menu:A(dd) D(elete) S(or) Q(uit),Select one:";
    cin>>n;
    while(n!='Q')
    {
        switch(n)
        {
            case'A':
                {
                    cout<<"数据已经增加"<<endl;break;

                }
                case 'D':
                    {
                        cout<<"数据已经删除"<<endl;break;

                    }
                case'S':
                    {
                        cout<<"数据已经排序"<<endl;break;

                    }
        }
        cin>>n;
    }
    return 0;
}

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(){
    int m,j,i,k=1;
    for(i=2;i<=100;i++){
    
        m=sqrt(i);
        for(j=2;j<=m;j++){
            if(i%j==0)break;
        }
        
        if(j>m){
        cout<<setw(5)<<i;
        k++;
        if(k>5){
            cout<<setw(5)<<endl;
            k=1;
        }
    }
    
    }
        return 0;    
}

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(){
    int m,j,i=1,k=1;
    while(i<=100){
    
        m=sqrt(i);
        for(j=2;j<=m;j++){
            if(i%j==0)break;
        }
        
        if(j>m&&i!=1){
        cout<<setw(5)<<i;
        k++;
        if(k>5){
            cout<<setw(5)<<endl;
            k=1;
        }
    }
    i++;
    }
        return 0;    
}

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main(){
    int m,j,i=1,k=1;
    do{
    
        m=sqrt(i);
        for(j=2;j<=m;j++){
            if(i%j==0)break;
        }
        
        if(j>m&&i!=1){
        cout<<setw(5)<<i;
        k++;
        if(k>5){
            cout<<setw(5)<<endl;
            k=1;
        }
    }
    i++;
    }while(i<=100);
        return 0;    
}

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main(){
    srand((unsigned)time(0));
    int m,n;
    m=rand()%100+1;
    cin>>n;
    while(n!=m){
        if(n>m)
            cout<<"比该数字小";
            cout<<"请再输入"<<endl;
        if(n<m)
            cout<<"比该数字大";
            cout<<"请再输入"<<endl; 
            cin>>n;
    }
    cout<<"猜对了";
    return 0;
    
}

#include<iostream>
#include<cstdlib>
#include<ctime>
using namespace std;
int main(){
    srand((unsigned)time(0));
    int m,n;
    m=rand()%100+1;
    cin>>n;
    do{
        if(n>m)
            cout<<"比该数字小";
            cout<<"请再输入"<<endl;
        if(n<m)
            cout<<"比该数字大";
            cout<<"请再输入"<<endl; 
            cin>>n;
    }while(n!=m);
    cout<<"猜对了";
    return 0;
    
}

#include<iostream>
using namespace std;

enum Packet{Red,Yellow,Blue,White,Black};    
void change(int n)
{
    switch(n)                              
    {
        case 0:cout<<"Red"<<endl;break;
        case 1:cout<<"Yellow"<<endl;break;
        case 2:cout<<"Blue"<<endl;break;
        case 3:cout<<"White"<<endl;break;
        case 4:cout<<"Black"<<endl;break;
    }
}
int main()
{
    int i,j,k,total=0;
    cout<<"The type:\n";
    for(i=Red;i<=Black;i++)                  
    {
        for(j=Red;j<=Black;j++)
        {
            for(k=Red;k<=Black;k++) 
            {
                if(i!=j&&i!=k&&j!=k)         
                {
                change(i);
                change(j);
                change(k);
                cout<<endl;
                ++total;         
                 }
            }
            
        }
    }
     cout<<"The count:"<<total<<endl;
     return 0;
 } 

#include<iostream>
using namespace std;

enum Packet{Red,Yellow,Blue,White,Black};    
void change(int n)
{
    switch(n)                              
    {
        case 0:cout<<"Red"<<endl;break;
        case 1:cout<<"Yellow"<<endl;break;
        case 2:cout<<"Blue"<<endl;break;
        case 3:cout<<"White"<<endl;break;
        case 4:cout<<"Black"<<endl;break;
    }
}
int main()
{
    int i,j,k,total=0;
    cout<<"The type:\n";
    for(i=Red;i<=Black;i++)                  
    {
        for(j=Red+i+1;j<=Black;j++)
        {
            for(k=Red+j+1;k<=Black;k++) 
            {
                if(i!=j&&i!=k&&j!=k)         
                {
                change(i);
                change(j);
                change(k);
                cout<<endl;
                ++total;         
                 }
            }
            
        }
    }
     cout<<"The count:"<<total<<endl;
     return 0;
 } 

这几个实验中，基本上都要求多种方法编程，对复习上学期C语言的知识有一定的帮助。

其中相较而言比较难的是枚举类型和随机函数，随机类型中rand和srand函数都很重要，在上网查阅和同学帮助下弄懂并完成。

而枚举类型中需要注意对枚举元素按常量处理，不能对它们赋值且枚举元素具有默认值，也可以在声名时另行定义枚举元素的值。枚举值可以进行关系运算，且整数值不能赋给枚举变量。

在编程过程中发现自身存在很多不足，以后会加紧学习。

 https://www.cnblogs.com/changtingzao/

 https://www.cnblogs.com/jackyayue/

https://www.cnblogs.com/zxz2425405395/