第六章 编程练习
第一题
1 #include<iostream> 2 #include<cctype> 3 using namespace std; 4 int main() 5 { 6 char arr[80]; 7 char ch; 8 cin.getline(arr,80); 9 int i=0; 10 ch=arr[0]; 11 while((ch!='@')&&(i<=80)) 12 { 13 if((ch>='a')&&(ch<='z'))cout<<char(toupper(ch)); 14 else if((ch>='A')&&(ch<='Z'))cout<<char(tolower(ch)); 15 else cout<<ch; 16 i++; 17 ch=arr[i]; 18 } 19 return 0; 20 }
第二题
1 #include<iostream> 2 #include<cctype> 3 using namespace std; 4 int main() 5 { 6 double temp; 7 double donation[10]; 8 double sum=0; 9 int count=0; 10 double ave=0; 11 int i; 12 for(i=0;i<10&&cin>>temp;i++) 13 { 14 donation[i]=temp; 15 sum+=donation[i]; 16 } 17 ave=sum/i; 18 for(int j=0;j<i;j++) 19 { 20 if(donation[j]>ave)count++; 21 } 22 if(i!=10)cout<<"input error"<<endl; 23 cout<<"the number of digit you have input "<<i<<endl; 24 cout<<"ave="<<ave<<endl; 25 cout<<"count="<<count<<endl; 26 return 0; 27 }
第三题
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 int main() 5 { 6 cout<<"please enter one of the following choices"<<endl; 7 cout<<"c)carnivore p)pianist"<<endl; 8 cout<<"t)tree g)game"<<endl; 9 char ch; 10 cout<<"intput your choice ,q to quit"; 11 cin>>ch; 12 while(ch!='q') 13 { 14 switch(ch) 15 { 16 case 'c':cout<<"carnivore"<<endl;break; 17 case 'p':cout<<"pianist"<<endl;break; 18 case 't':cout<<"tree"<<endl;break; 19 case 'g':cout<<"game"<<endl;break; 20 default:cout<<"please enter a c,p,t,g"; 21 } 22 cin>>ch; 23 } 24 return 0; 25 }
网上下载版：
1 #include <iostream> 2 using namespace std; 3 void main() 4 { 5 cout<<"Please enter one of the following choices :"<<endl; 6 cout<<"c) carnivore p) pianist"<<endl; 7 cout<<"t) tree g) game"<<endl; 8 char ch; 9 //boolean 10 bool flag=true; //用于跳出循环 11 while(flag) 12 { 13 cout<<"\nPlease enter a a c,p,t,or g:"; 14 cin>>ch; 15 switch(ch) 16 { 17 case 'c':cout<<"A mape is a carnivore",flag=false;break; 18 case 'p':cout<<"A mape is a pianist",flag=false;break; 19 case 't':cout<<"A mape is a tree",flag=false;break; 20 case 'g':cout<<"A mape is a game",flag=false;break; 21 default:; 22 } 23 24 } 25 26 system("pause"); 27 28 }
第四题
1 #include<iostream> 2 using namespace std; 3 const int strsize=20; 4 5 struct bop 6 { 7 char fullname[strsize]; 8 char title[strsize]; 9 char bopname[strsize]; 10 int preference; 11 }; 12 void displayfullname(bop *); 13 void displaytitle(bop *); 14 void displaybopname(bop *); 15 void displaypreference(bop *); 16 int main() 17 { 18 bop arr[5]={{"fullname1","title1","bopname1",0},{"fullname2","title2","bopname2",1},{"fullname3","title3","bopname3",2},{"fullname4","title4","bopname4",1},{"fullname5","title5","bopname5",2}}; 19 cout<<"benevolent order if progreammers report"<<endl; 20 cout<<"a.display by name b.display by title"<<endl; 21 cout<<"c.display by bopname d.display by preference"<<endl; 22 cout<<"q.quit"<<endl; 23 char ch; 24 cout<<"enter your choice"; 25 cin>>ch; 26 while(ch!='q') 27 { 28 switch(ch) 29 {case 'a':displayfullname(arr);break; 30 case 'b':displaytitle(arr);break; 31 case 'c':displaybopname(arr);break; 32 case 'd':displaypreference(arr);break; 33 default:cout<<"enter wrong";} 34 cout<<"next choice"; 35 cin>>ch; 36 } 37 } 38 39 void displayfullname(bop * a) 40 { 41 for(int i=0;i<5;i++) 42 cout<<a[i].fullname<<endl; 43 } 44 45 void displaytitle(bop *a) 46 { 47 for(int i=0;i<5;i++) 48 cout<<a[i].title<<endl; 49 } 50 void displaybopname(bop *a) 51 { 52 for(int i=0;i<5;i++) 53 cout<<a[i].bopname<<endl; 54 } 55 void displaypreference(bop *a) 56 { 57 int s; 58 for(int i=0;i<5;i++) 59 { 60 s=a[i].preference; 61 switch(s) 62 {case 0:cout<<a[i].fullname;break; 63 case 1:cout<<a[i].title;break; 64 case 2:cout<<a[i].bopname;break; 65 default:cout<<"enter wrong";} 66 cout<<endl; 67 } 68 }
网上下载
1 #include <iostream> 2 using namespace std; 3 const int strsize=20; 4 5 struct bop{ 6 char fullname[strsize]; //real name 7 char title[strsize]; //job title 8 char bopname[strsize]; //secret BOP name 9 int preference; //0=fullname 1=title 2=bopname 10 }; 11 void getCout(char c,bop *b); 12 void main() 13 { 14 bop b[4]={{"Chen shiguang","Coder","guang",1}, //初始化数组 15 {"Lijing","Student","Li",2}, 16 {"Lijing2","Student2","Li2",2}, 17 {"Chenguang","dent","ci",0} 18 }; 19 20 cout<<"Benevolent order of Programmers Report"<<endl; 21 cout<<"a.display by name b.display by title"<<endl; 22 cout<<"c.display by bopname d.display by priference"<<endl; 23 cout<<"q.quit"<<endl; 24 cout<<"Enter your choice:"; 25 char ch; 26 cin>>ch; 27 while(ch!='q') 28 { 29 30 switch(ch) 31 { 32 case 'a':for(int i=0;i<4;i++){ 33 cout<<b[i].fullname<<endl; 34 };break; 35 case 'b':for(int i=0;i<4;i++){ 36 cout<<b[i].title<<endl; 37 };break; 38 case 'c':for(int i=0;i<4;i++){ 39 cout<<b[i].bopname<<endl; 40 };break; 41 case 'd':getCout(ch,b);break; 42 //<span style="white-space:pre"> </span>default:cout<<"wrong input"<<endl; 43 //case 'q':cout<<"bye"<<endl,cin.get(),exit(1); 44 45 } 46 cout<<"Next Choice:"; 47 cin>>ch; 48 } 49 cout<<"bye"<<endl; 50 cin.get(); 51 } 52 53 void getCout(char c,bop *b)//<span style="white-space:pre"> </span>//选择为preference时调用的函数 54 { 55 int s; 56 for(int i=0;i<4;i++,b++) 57 { 58 s=b->preference; 59 switch(s){ 60 case 0:cout<<b->fullname<<endl;break; 61 case 1:cout<<b->title<<endl;break; 62 case 2:cout<<b->bopname<<endl;break; 63 default:cout<<"wrong request!"; 64 } 65 } 66 }
第五题
1 #include<iostream> 2 using namespace std; 3 int main() 4 { 5 int income; 6 cout<<"intput your income: "; 7 cin>>income; 8 double tax; 9 while(income>=0) 10 { 11 if(income<=5000)tax=0; 12 else if(income>5000&&income<=15000)tax=(income-5000)*0.1; 13 else if(income>15000&&income<=35000)tax=1000+(income-15000)*0.15; 14 else tax=4000+(income-35000)*0.2; 15 cout<<"your tax="<<tax<<endl; 16 cout<<"intput your income: "; 17 cin>>income; 18 } 19 return 0; 20 }
第六题
1 #include<iostream> 2 #include<vector> 3 #include<string> 4 using namespace std; 5 struct a 6 { 7 string name; 8 double num; 9 }; 10 11 int main() 12 { 13 int s; 14 cout<<"the number of the people:"; 15 cin>>s; 16 vector<a>ps(s); 17 for(int i=0;i<s;i++) 18 { 19 cout<<"the name and the number of no."<<i+1<<" people"<<endl; 20 cin>>ps[i].name>>ps[i].num; 21 } 22 cout<<"grand patrins:"<<endl; 23 int count=0; 24 for(int i=0;i<s;i++) 25 { 26 27 if(ps[i].num>1000) 28 { 29 cout<<ps[i].name<<", "<<ps[i].num<<endl; 30 count++; 31 } 32 33 } 34 if(count==0)cout<<"none"; 35 36 cout<<endl<<endl<<"patrons"<<endl; 37 count=0; 38 for(int i=0;i<s;i++) 39 { 40 41 if(ps[i].num<=1000) 42 { 43 cout<<ps[i].name<<", "<<ps[i].num<<endl; 44 count++; 45 } 46 47 } 48 if(count==0)cout<<"none"; 49 return 0; 50 }
第七题
1 #include<iostream> 2 #include<string> 3 #include<cctype> 4 using namespace std; 5 const int size =10; 6 int main() 7 { 8 char temp[size]; 9 cout<<"enter the world:"; 10 cin>>temp; 11 int yuanyin=0; 12 int fuyin=0; 13 int other =0; 14 while(temp[0]!='q') 15 { 16 cout<<temp<<" "; 17 if(!isalpha(temp[0]))other++; 18 else { 19 if(temp[0]=='a'||temp[0]=='e'||temp[0]=='i'||temp[0]=='o'||temp[0]=='u')yuanyin++; 20 else fuyin++; 21 } 22 cin>>temp; 23 } 24 cout<<"yuanyin="<<yuanyin<<endl; 25 cout<<"fuyin="<<fuyin<<endl; 26 cout<<"other="<<other<<endl; 27 return 0; 28 }
第八题
1 #include<iostream> 2 #include<fstream> 3 #include<string> 4 using namespace std; 5 int main() 6 { 7 string name; 8 char ch; 9 int count=0; 10 ifstream infile; 11 cout<<"input the title of the file:"; 12 cin>>name; 13 infile.open(name); 14 if(!infile.is_open())cout<<"open failed"<<endl; 15 else cout<<"open success"<<endl; 16 infile>>ch; 17 while(infile.good()) 18 { 19 cout<<ch; 20 if(ch!=' ')count++; 21 infile>>ch; 22 } 23 cout<<endl<<"munber of the char ="<<count<<endl; 24 infile.close(); 25 return 0; 26 }
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第九题
1 #include<fstream> 2 #include<stdlib.h> 3 #include<iostream> 4 #include<string> 5 #include<vector> 6 using namespace std; 7 struct a 8 { 9 string name; 10 double num; 11 }; 12 int main() 13 { 14 string filename; 15 cout<<"enter the filename:"; 16 cin>>filename; 17 ifstream infile; 18 infile.open(filename); 19 if(!infile.is_open())cout<<"open failed"<<endl; 20 else cout<<"open success"<<endl; 21 22 int n; 23 string temp; 24 getline(infile,temp); 25 n=atoi(temp.c_str());//atoi头文件#include<stdlib.h> 26 vector<a>ps(n); 27 28 for(int i=0;i<n;i++) 29 { 30 getline(infile,ps[i].name); 31 getline(infile,temp); 32 ps[i].num=atoi(temp.c_str()); 33 } 34 cout<<endl<<endl<<" grandpatrons"<<endl; 35 int count=0; 36 for(int i=0;i<n;i++) 37 { 38 if(ps[i].num>10000) 39 { 40 cout<<ps[i].name<<", "<<ps[i].num<<endl; 41 count++; 42 } 43 44 } 45 if(count==0)cout<<"none"; 46 47 cout<<endl<<endl<<"patrons"<<endl; 48 count=0; 49 for(int i=0;i<n;i++) 50 { 51 52 if(ps[i].num<=10000) 53 { 54 cout<<ps[i].name<<", "<<ps[i].num<<endl; 55 count++; 56 } 57 58 } 59 if(count==0)cout<<"none"; 60 return 0; 61 }
