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实验1:c++简单程序设计(1)

时间:2019-03-14 00:32:30      阅读:232      评论:0      收藏:0      [点我收藏+]

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//文中有格式错误请无视

//这个编辑器一言难尽

实验目的


 

1. 掌握c++中类c部分的编程知识: 数据类型,常量,变量,运算符,表达式,分支结构,循环结构

2. 掌握C++中数据输入和输出的基本方法

3. 熟练使用c++程序开发环境,掌握c++程序编写、编译、运行、调试的方法

实验准备


 

1. 简单的c++程序结构 学习/复习教材「2.1.3 C++程序实例」

2. c++中数据输入输出的基本方法 学习/复习教材2.3节,学习C++中I/O流、预定义的插入符<<和提取符>>的基本用法。

3. if语句、switch语句、while语句、do…while语句的用法 学习/复习教材2.4节,通过示例理解背后简单算法及c++分支语句、循环语句的用法 

4. 自定义数据类型: typedef,枚举类型用法 学习/复习教材2.5节,结合示例理解枚举类型和int型在类型转换时的注意事项

实验内容

 


 

Part2: 编程练习

教材第2章习题2-28 简单的菜单程序

教材第2章习题2-29 穷举法求质数

教材第2章习题2-32 猜数

教材第2章习题2-34排列组合

实验结论


 

2-28简单的菜单程序(if-else

Code:

 1 #include<iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     cout<<"Menu:A(dd) D(elete) S(ort) Q(uit)";
 6     cout<<"Select one:";
 7     char k;
 8     while(cin>>k)
 9     {
10         if(k==A)
11             cout<<"Data has added.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
12         else if(k==D)
13             cout<<"Data has deleted.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
14         else if(k==S)
15             cout<<"Data has sorted.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
16         else if(k==Q)
17             break;
18         else
19             cout<<"No such choice,please select again.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
20     }
21     return 0;
22 }

 Screenshot:

技术图片

(switch

Code:

 1 #include<iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     cout<<"Menu:A(dd) D(elete) S(ort) Q(uit)";
 6     cout<<"Select one:";
 7     char k;
 8     while(cin>>k&&k!=Q)
 9     {
10         switch(k)
11         {
12             case A:
13                 cout<<"Data has added.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
14                 continue;
15             case D:
16                 cout<<"Data has deleted.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
17                 continue;
18             case S:
19                 cout<<"Data has sorted.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
20                 continue;
21             default:cout<<"No such choice,please select again.\n"<<"Menu:A(dd) D(elete) S(ort) Q(uit)"<<"Select one:";
22         }
23     }
24     return 0;
25 }

 Screenshop:

技术图片

 2-29 穷举法求质数(while

Code:

 1 #include<iostream>
 2 #include<cmath>
 3 #include<iomanip>
 4 using namespace std;
 5 int main()
 6 {
 7     cout<<"1~100间的质数为:"<<endl; 
 8     int x=1;
 9     int a,b,c=0;
10     while(x<=100)
11     {
12         a=sqrt(x);
13         if(x!=1)
14         {
15             b=2;
16             while(x%b!=0&&b<=a)
17                  b++; 
18             if(b>a)
19             {
20                 c++;
21                 cout<<setw(5)<<x;
22                 if(c%5==0)
23                     cout<<"\n";
24             }
25         }
26         x++;
27     }
28     return 0;
29  } 

 

 Screenshop:

技术图片

(for

Code:

 1 #include<iostream>
 2 #include<cmath>
 3 #include<iomanip>
 4 using namespace std;
 5 int main()
 6 {
 7     cout<<"1~100间的质数为:"<<endl; 
 8     int x;
 9     int a,b,c=0;
10     for(x=1;x<=100;x++)
11     {
12         a=sqrt(x);
13         if(x==1)
14             continue;
15         else
16         {
17             for(b=2;b<=a;b++)
18                 if(x%b==0)
19                     break;
20             if(b>a)
21             {
22                 c++;
23                 cout<<setw(5)<<x;
24                 if(c%5==0)
25                     cout<<"\n";
26             }
27         }
28     }
29     return 0;
30  } 

 

Screenshop:

技术图片

 

(do-while

Code:

 1 #include<iostream>
 2 #include<cmath>
 3 #include<iomanip>
 4 using namespace std;
 5 int main()
 6 {
 7     cout<<"1~100间的质数为:"<<endl; 
 8     int x=0;
 9     int a,b,c=0;
10     do
11     {
12         x++;
13         a=sqrt(x);
14         if(x!=1)
15         {
16             b=1;
17             do
18             {
19                 b++;
20             }while(x%b!=0&&b<=a);
21             if(b>a)
22             {
23                 c++;
24                 cout<<setw(5)<<x;
25                 if(c%5==0)
26                     cout<<"\n";
27             }
28         }
29     }while(x<100);
30     return 0;
31  } 

 

 

 

 

 

Screenshop:

技术图片

 

2-32 猜数(while

 

Code:

 

 1 #include<iostream>
 2 #include<ctime>
 3 #include<cstdlib>
 4 using namespace std;
 5 int main()
 6 {
 7     int x;
 8     int a;
 9     srand(time(NULL));
10     x=1+rand()%(100-1+1);
11     cout<<"Your guess number is(1~100): ";
12     cin>>a;
13     while(a!=x)
14     {
15         if(a<x)
16         {
17             cout<<"Bigger than the number."<<endl;
18             cout<<"Your guess number is(1~100): ";
19             cin>>a;
20         }
21         else
22         {
23             cout<<"Lower than the number. "<<endl;
24             cout<<"Your guess number is(1~100): ";
25             cin>>a;
26         }
27     }
28     cout<<"Congretulations.You guessed it.~";
29     return 0;
30  }

 

Screenshop:

 技术图片

 

(do-while

 

Code:

 

 1 #include<iostream>
 2 #include<ctime>
 3 #include<cstdlib>
 4 using namespace std;
 5 int main()
 6 {
 7     int x;
 8     int a;
 9     srand(time(NULL));
10     x=1+rand()%(100-1+1);
11     cout<<"Your guess number is(1~100): ";
12     do
13     {
14         cin>>a;
15         if(a<x)
16         {
17             cout<<"Bigger than the number."<<endl;
18             cout<<"Your guess number is(1~100): ";
19         }
20         else if(a>x)
21         {
22             cout<<"Lower than the number. "<<endl;
23             cout<<"Your guess number is(1~100): ";
24         }
25     }while(a!=x);
26     cout<<"Congretulations.You guessed it.~";
27     return 0;
28  }

 

Screenshop:

技术图片

 

 //暴力循环

2-34排列组合(排列

 

Code:

 

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std; 
 4 int main()
 5 {
 6     int x[3],k=0,i;
 7     for(x[0]=1;x[0]<=5;x[0]++)
 8     {
 9         for(x[1]=1;x[1]<=5;x[1]++)
10         {
11             if(x[1]==x[0])
12                 continue;
13             else
14             {
15                 for(x[2]=1;x[2]<=5;x[2]++)
16                 {
17                     if(x[2]==x[0]||x[2]==x[1])
18                         continue;
19                     else
20                     {
21                         k++;
22                         for(i=0;i<=2;i++)
23                         {
24                             if(i!=2)
25                            {
26                                 switch(x[i])
27                                 {
28                                     case 1:
29                                         cout<<"red ";
30                                         continue;
31                                     case 2:
32                                         cout<<"yellow ";
33                                         continue;
34                                     case 3:
35                                         cout<<"blue ";
36                                         continue;
37                                     case 4:
38                                         cout<<"white ";
39                                         continue;
40                                     case 5: 
41                                         cout<<"black ";
42                                 }
43                             }
44                             else
45                             {
46                                 switch(x[i])
47                                 {
48                                     case 1:
49                                         cout<<"red\n";
50                                         continue;
51                                     case 2:
52                                         cout<<"yellow\n";
53                                         continue;
54                                     case 3:
55                                         cout<<"blue\n";
56                                         continue;
57                                     case 4:
58                                         cout<<"white\n";
59                                         continue;
60                                     case 5:
61                                     cout<<"black\n";
62                                 }
63                             }
64                         }    
65                     }
66                 }
67             }
68         }
69     }
70     cout<<"Total: "<<k;
71     return 0;
72  }

 

Screenshop:

技术图片

 

 

(组合

 

Code:

 

 1 #include<iostream>
 2 #include<iomanip>
 3 using namespace std; 
 4 int main()
 5 {
 6     int x[3],k=0,i;
 7     for(x[0]=1;x[0]<=5;x[0]++)
 8         for(x[1]=x[0]+1;x[1]<=5;x[1]++)
 9             for(x[2]=x[1]+1;x[2]<=5;x[2]++)
10             { 
11                 k++;
12                 for(i=0;i<=2;i++)
13                 {
14                     if(i!=2)
15                     {
16                         switch(x[i])
17                         {
18                             case 1:
19                                 cout<<"red ";
20                                 continue;
21                             case 2:
22                                 cout<<"yellow ";
23                                 continue;
24                             case 3:
25                                 cout<<"blue ";
26                                 continue;
27                             case 4:
28                                 cout<<"white ";
29                                 continue;
30                             case 5: 
31                                 cout<<"black ";
32                         }
33                     }
34                     else
35                     {
36                         switch(x[i])
37                         {
38                             case 1:
39                                 cout<<"red\n";
40                                 continue;
41                             case 2:
42                                 cout<<"yellow\n";
43                                 continue;
44                             case 3:
45                                 cout<<"blue\n";
46                                 continue;
47                             case 4:
48                                 cout<<"white\n";
49                                 continue;
50                             case 5:
51                             cout<<"black\n";
52                         }
53                     }
54                 }
55             }    
56     cout<<"Total: "<<k;
57     return 0;
58  }

 

Screenshop:

技术图片

 实验总结


 

这次试验主要是类C的部分,CPP的特性我还没有完全体会到(从I/O流已经可以看出些特点的程度)。

在进行多次判断时还是用switch更方便。

多数时候for循环较为好用。

写程序时尽量避免嵌套过多层循环,严重拖慢编译和运行速度。

srand(time(NULL));

x=1+rand()%(100-1+1);

以此来取一定范围内的随机数。

枚举数据类型不同于整型或字符型。

实验1:c++简单程序设计(1)

标签:示例   编辑器   循环结构   lower   知识   guess   art   sorted   info   

原文地址:https://www.cnblogs.com/wyf-blogs/p/10527198.html

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