2020 我的C++学习之路 C++PrimerPlus第九章课后习题

以C++ Primer Plus为参考书籍，自身归纳知识点，加深记忆。仅供参考，DEV C++已通过编译运行
。
练习1

//golf.h
const int Len = 40;
struct golf
{char fullname[Len];int handicap;
};void setgolf(golf& g, const char* name, int hc);
int setgolf(golf& g);
void handicap(golf& g, int hc);
void showgolf(const golf& g);

//function part
#include<iostream>
#include<cstring>
#include"p1.h"void setgolf(golf& g, const char* name, int hc)
{strcpy_s(g.fullname,name);g.handicap = hc;
}
int setgolf(golf& g)
{using std::cout;using std::cin;cout << "Enter fullname: ";if (cin.getline(g.fullname, 40) && strlen(g.fullname))//空字符串不等于空格串，空字符串的strlen为0，空格串为1{cout << "Enter the handicap: ";cin >> g.handicap;cin.get();return 1;}else{cout << "error";return 0;}
}
void handicap(golf& g, int hc)
{g.handicap = hc;
}
void showgolf(const golf& g)
{using std::cout;using std::cin;using std::endl;cout << "  FULLNAME: " << g.fullname << endl;cout << "  HANDICAP: " << g.handicap << endl;
}

#include<iostream>
#include"p1.h"int main()
{golf golfar[3];golf golfacc;for (int i = 0; i < 3; ++i){if (!setgolf(golfar[i]))break;}setgolf(golfacc, "Ann Birdfree", 24);showgolf(golfacc);handicap(golfacc, 30);showgolf(golfacc);return 0;
}

练习2

#include<iostream>
#include<string>
#include<cctype>void strcount(const std::string str);int main()
{using namespace std;string input;cout << "Enter a line:\n";getline(cin, input);while (cin){strcount(input);cout << "Enter next line(empty line to quit):\n";getline(cin, input);}}void strcount(const std::string str)
{using namespace std;static int total = 0;int count = 0;if (str == "")cout << "BLANK!\n";else{for (int cnt = 0; cnt < str.size(); ++cnt)//str.size()返回所有非‘\0’字符的长度，与题设不符{if (isalpha(str[cnt]))++count;}total += count;cout << "\"" << str << "\" contains ";cout << count << " characters\n";cout << total << " characters total\n";}}

练习3
方法一

#include<iostream>struct chaff
{char dross[20];int slag;
};char buffer[500];int main()
{using namespace std;chaff* structsr = new(buffer)chaff[2];for (int i = 0; i < 2; ++i){cout << "Enter dross[20]: ";cin.getline(structsr[i].dross, 20);cout << "Enter slag: ";cin >> structsr[i].slag;cin.get();}for (int i = 0; i < 2; ++i){cout << "DROSS: " << structsr[i].dross << endl;cout << "SLAG: " << structsr[i].slag << endl;}return 0;
}

方法二

#include<iostream>struct chaff
{char dross[20];int slag;
};int main()
{using namespace std;chaff* ptr = new chaff[2];for (int i = 0; i < 2; ++i){cout << "Enter dross[20]: ";cin.getline(ptr[i].dross, 20);cout << "Enter slag: ";cin >> ptr[i].slag;cin.get();}for (int i = 0; i < 2; ++i){cout << "DROSS: " << ptr[i].dross << endl;cout << "SLAG: " << ptr[i].slag << endl;}delete[]ptr;return 0;
}

练习4

//p4.h
namespace SALES
{const int QUARTERS = 4;struct Sales{double sales[QUARTERS];double average;double max;double min;};void setSales(Sales& s, const double ar[], int n);void setSales(Sales& s);void showSales(const Sales& s);
}

//function part
#include<iostream>
#include"p4.h"namespace SALES
{void setSales(Sales& s, const double ar[], int n){double sum = 0;for (int i = 0; i < n; ++i){s.sales[i] = ar[i];sum += s.sales[i];}s.average = sum / n;double tempmax, tempmin;tempmax = tempmin = ar[0];for (int i = 0; i < n; ++i){if (tempmax < s.sales[i])tempmax = s.sales[i];if (tempmin > s.sales[i])tempmin = s.sales[i];}s.max = tempmax;s.min = tempmin;}void setSales(Sales& s){using std::cout;using std::cin;using std::endl;int cnt = 0;cout << "Enter sales array: ";while (cnt < QUARTERS && cin >> s.sales[cnt] )//顺序不可替换，否则会多一次录入，虽然录入并没有什么用++cnt;double sum = 0;for (int i = 0; i < cnt; ++i)sum += s.sales[i];s.average = sum / cnt;double tempmax, tempmin;tempmax = tempmin = s.sales[0];for (int i = 0; i < cnt; ++i){if (tempmax < s.sales[i])tempmax = s.sales[i];if (tempmin > s.sales[i])tempmin = s.sales[i];}s.max = tempmax;s.min = tempmin;}void showSales(const Sales& s){using namespace std;for (int i = 0; i < QURATES ; ++i)cout << "SALES[" << i << "]: " << s.sales[i] << endl;cout << "AVERAGE: " << s.average << endl;cout << "MAX: " << s.max << endl;cout << "MIN: " << s.min << endl;}
}

#include<iostream>
#include"p4.h"int main()
{using SALES::Sales;using SALES::setSales;using SALES::showSales;Sales test1;double arr[3] = { 1.3,6.2,2.8 };setSales(test1, arr, 3);//程序存在瑕疵，原因在于arr小于4个时，show也打印出4个，但是把showSales(test1);//后续部分都处理成0也貌似有点不妥的样子，所以大概就这样吧：）Sales test2;setSales(test2);showSales(test2);return 0;
}

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