C++Primerplus编程练习 第五章

第五章

1

#include <iostream>int main()
{using namespace std;int low;int high;long result=0;cout << "请输入两个整数"<<endl;cout << "第一个较小的整数: ";cin >> low;cout << "第二个较大的整数: ";cin >> high;cout << low <<" 到 " << high<<" 之间所有整数和为 ";for(;low<=high;low++){                                                 result +=low;}   cout << result <<endl;return 0;
}

2

#include <iostream>
#include <array>
int main()
{using namespace std;const int AR_SIZE = 101;                                               array<long double, AR_SIZE> factorials;factorials[0]=factorials[1]=1;for(int i=2;i<AR_SIZE;i++){factorials[i]=factorials[i-1]*i;}   for(int i=0;i<AR_SIZE;i++){cout<<i << "!= " << factorials[i]<<endl;}   return 0;
}

3

#include <iostream>
int main()
{using namespace std;long long result=0;cout << "请输入数字，输入0时停止" <<endl;int temp;cin >> temp;while(temp !=0){result += temp;if(cin.get()=='\n'){cout << "目前的总和为 "<< result<<endl;                        }   cin >> temp;}   return 0;
}

4

#include <iostream>int main()
{using namespace std;                                                   const double DEPOSIT=100;const double singleMargin=0.1;const double compoundMargin=0.05;double DaphneProfit=0;double CleoProfit=0;int year=0;while(CleoProfit<=DaphneProfit){CleoProfit += (DEPOSIT+CleoProfit)*compoundMargin;DaphneProfit += DEPOSIT*singleMargin;year++;}   cout << year << " 年后Cleo的利润超过Daphne \n"<< "Cleo 的利润为 " << CleoProfit<<endl<< "Daphne 的利润为 " << DaphneProfit << endl;return 0;
}

5

#include <iostream>
#include <string>
int main()
{using namespace std;const int MONTHNUM=12;const string MONTH[MONTHNUM] {"一月", "二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};  int sales[MONTHNUM];int all =0; for(int i=0;i<MONTHNUM;i++){cout << "请输入"<<MONTH[i] << "的销售额 ";                         cin >> sales[i];all += sales[i];}   cout << "总销售额为 " << all <<" 元\n";return 0;
}

6

#include <iostream>
#include <string>
int main()
{using namespace std;const int MONTHNUM=12;const string MONTH[MONTHNUM] {"一月", "二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};  int sales[3][MONTHNUM];int all =0;for(int j=0;j<3;j++){cout << "请输入第 " << j+1<< " 年的销售记录"<<endl;for(int i=0;i<MONTHNUM;i++){                                       cout << "请输入"<<MONTH[i] << "的销售额 ";cin >> sales[j][i];all += sales[j][i];}   }   cout << "总销售额为 " << all <<" 元\n";return 0;
}

7

#include <iostream>
#include <string>
using namespace std;
struct car{string manufacturer;int year;
};
int main()
{int carNum;car* carArray;cout << "How many cats do you wish to catalog? ";cin >> carNum;cin.get();carArray = new car [2];for(int i=0;i<carNum;i++){cout << "Car #"<<i<<" :"<<endl<<"Please enter the make: ";getline(cin,carArray[i].manufacturer);cout << "Please enter the year made: ";cin >> carArray[i].year;cin.get();}                                                                      cout << "Here is your collection:"<<endl;for(int i=0;i<carNum;i++){cout<<carArray[i].year<<" "<<carArray[i].manufacturer<<endl;}   delete [] carArray;return 0;
}

8

#include <iostream>
#include <cstring>
int main()
{using namespace std;char words[50];int wordNum=0;cout << "Enter words (to stop, type the word done): "<<endl;cin >> words;while(strcmp(words, "done")){wordNum++;cin>>words;}   cout << "You entered a total of " << wordNum << " words."<<endl;       return 0;
}

9

#include <iostream>
#include <string>
int main()
{using namespace std;string words;int wordNum=0;cout << "Enter words (to stop, type the word done): "<<endl;cin >> words;while(words!="done"){                                                  wordNum++;cin>>words;}   cout << "You entered a total of " << wordNum << " words."<<endl;return 0;
}

10

#include <iostream>int main()
{using namespace std;int rows;cout << "Enter number of rows: ";cin >> rows;for(int i=0;i<rows;i++){for(int j=rows-i-1;j>0;j--){cout<<'.';}for(int j=i+1;j>0;j--){cout<<'*';}cout <<endl;}                                                                      return 0;
}