编程环境Visual Studio 2017
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// chapter9.cpp #include <iostream> #include <string> #include <cstring> #include <cctype> #include <new> #include "sales.h" using namespace std; // practice 1 const int Len = 40; struct golf { char fullname[Len]; int handicap; }; void setgolf(golf & g, const char * name, int hc) { strcpy(g.fullname, name); g.handicap = hc; } int setgolf(golf & g) { cout << "Please enter the full name of golf player: "; cin.getline(g.fullname, Len); if (strcmp(g.fullname, "") == 0) { return 0; } cout << "Please enter the hanicap of golf player: "; cin >> g.handicap; cin.get(); return 1; } void handicap(golf & g, int hc) { g.handicap = hc; } void showgolf(const golf & g) { cout << "full name of golf player: " << g.fullname << endl; cout << "handicap of golf player: " << g.handicap << endl; } void p9_1(void) { golf g[10]; int n = 0; cout << "Enter the information of golf player: " << endl; while ((n < 10) && (setgolf(g[n]))) { n++; cout << "Next golf player: " << endl; } cout << "Show all golf player information: " << endl; for (int i = 0; i < n; i++) { showgolf(g[i]); } } // practice 2 const int ArSize = 10; void strcount(const string str) { static int total = 0; int count = 0; cout << "\"" << str.c_str() << "\" contains "; while (str[count]) { count++; } total += count; cout << count << " characters\n"; cout << total << " characters total\n"; } void p9_2(void) { 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); if (input == "") { break; } } cout << "Bye\n"; return; } // practice 3 struct chaff { char dross[20]; int slag; }; char buffer[1024]; void p9_3(void) { chaff *pcha = new (buffer) chaff[2]; char *pc = new char[1024]; chaff *pcha2 = new (pc) chaff[2]; char dross[20] = { 0 }; int slag = 0; for (int i = 0; i < 2; i++) { cout << "Enter dross of #" << i << " chaff: " << endl; cin.getline(dross, 20); cout << "Enter slag of #" << i << " chaff: " << endl; cin >> slag; cin.get(); strcpy(pcha[i].dross, dross); strcpy(pcha2[i].dross, dross); pcha[i].slag = pcha2[i].slag = slag; } for (int i = 0; i < 2; i++) { cout << "staff #" << (i + 1) << ":" << endl; cout << "pcha.dross: " << pcha[i].dross << ". pcha.slag: " << pcha[i].slag << endl; cout << "pcha2.dross: " << pcha2[i].dross << ". pcha2.slag: " << pcha2[i].slag << endl; } cout << "address of buffer: " << (void *)buffer << endl; cout << "address of pcha: " << pcha << ". address of pcha[0]: " << &pcha[0] << ". address of pcha[1]: " << &pcha[1] << endl; cout << "address of pc: " << (void *)pc << endl; cout << "address of pcha2:" << pcha2 << ". address of pcha2[0]: " << &pcha2[0] << ". address of pcha2[1]: " << &pcha2[1] << endl;; delete[] pc; } // practice 4 void p9_4(void) { SALES::Sales sales1; SALES::Sales sales2; double ar[3] = { 32.1, 23.2, 65.3 }; SALES::setSales(sales1, ar, 3); SALES::setSales(sales2); SALES::showSales(sales1); SALES::showSales(sales2); } int main(int argc, char **argv) { p9_4(); while (cin.get()); return 0; } // sales.h #pragma once #include <iostream> 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); } // sales.cpp #include "sales.h" namespace SALES { using namespace std; void setSales(Sales & s, const double ar[], int n) { double total = 0.0; double max = ar[0]; double min = ar[0]; for (int i = 0; i < n; i++) { total += ar[i]; s.sales[i] = ar[i]; if (max < ar[i]) { max = ar[i]; } if (min > ar[i]) { min = ar[i]; } } for (int i = n; i < QUARTERS; i++) { s.sales[i] = 0.0; } s.average = total / n; s.max = max; s.min = min; } void setSales(Sales & s) { double total = 0.0; double max = 0.0; double min = 0.0; double input = 0.0; cout << "Enter 4 double number; " << endl; for (size_t i = 0; i < QUARTERS; i++) { cin >> input; if (i == 0) { max = input; min = input; } if (min > input) { min = input; } if (max < input) { max = input; } total += input; s.sales[i] = input; } s.average = total / QUARTERS; s.max = max; s.min = min; } void showSales(const Sales & s) { cout << "sales: "; for (size_t i = 0; i < QUARTERS; i++) { cout << s.sales[i] << " "; } cout << endl; cout << "average: " << s.average << endl; cout << "max: " << s.max << endl; cout << "min: " << s.min << endl; } } |
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