【C++ Primer Plus】编程练习答案——第4章
1 void ch4_1() { 2 using namespace std; 3 string fname, lname; 4 char grade; 5 unsigned int age; 6 cout << "enter first name: "; 7 getline(cin, fname); 8 cout << "enter last name: "; 9 getline(cin, lname); 10 cout << "enter your grade: "; 11 cin >> grade; 12 cout << "enter your age: "; 13 cin >> age; 14 cout << "Name: " << lname << ", " << fname << endl; 15 cout << "Grade: " << grade + 1 << endl; 16 cout << "Age: " << age << endl; 17 } 18 19 void ch4_2() { 20 using namespace std; 21 string name, dessert; 22 cout << "Enter your name: "; 23 getline(cin, name); 24 cout << "Enter your favorite dessert: "; 25 getline(cin, dessert); 26 cout << "I have some delicious " << dessert << " for you, " << name << "." << endl; 27 } 28 29 void ch4_3() { 30 using namespace std; 31 char fname[20], lname[20], combine[41]; 32 cout << "enter your first name: "; 33 cin.getline(fname, 20); 34 cout << "enter your last name: "; 35 cin.getline(lname, 20); 36 strcpy(combine, lname); 37 strcat(combine, ", "); 38 strcat(combine, fname); 39 cout << "Here's the information in a single string: " << combine << endl; 40 } 41 42 void ch4_4() { 43 using namespace std; 44 string fname, lname, combine; 45 cout << "enter your first name: "; 46 getline(cin, fname); 47 cout << "enter your last name: "; 48 getline(cin, lname); 49 combine = lname + ", " + fname; 50 cout << "Here's the information in a single string: " << combine << endl; 51 } 52 53 void ch4_5() { 54 using namespace std; 55 struct CandyBar{ 56 string brand; 57 double weight; 58 unsigned int kll; 59 }; 60 CandyBar snack = {"Mocha Munch", 2.3, 350}; 61 cout << "brand: " << snack.brand << endl 62 << "weight: " << snack.weight << endl 63 << "kll: " << snack.kll << endl; 64 } 65 66 void ch4_6() { 67 using namespace std; 68 struct CandyBar{ 69 string brand; 70 double weight; 71 unsigned int kll; 72 }; 73 CandyBar snack; 74 cout << "enter brand: "; 75 getline(cin, snack.brand); 76 cout << "enter weight: "; 77 cin >> snack.weight; 78 cout << "enter kll: "; 79 cin >> snack.kll; 80 cout << "brand: " << snack.brand << endl 81 << "weight: " << snack.weight << endl 82 << "kll: " << snack.kll << endl; 83 } 84 85 void ch4_7() { 86 using namespace std; 87 struct Pizza{ 88 string brand; 89 double diameter; 90 double weight; 91 }; 92 Pizza pizza; 93 cout << "enter brand: "; 94 getline(cin, pizza.brand); 95 cout << "enter weight: "; 96 cin >> pizza.weight; 97 cout << "enter diameter: "; 98 cin >> pizza.diameter; 99 cout << "brand: " << pizza.brand << endl 100 << "weight: " << pizza.weight << endl 101 << "diameter: " << pizza.diameter << endl; 102 } 103 104 void ch4_8() { 105 using namespace std; 106 struct Pizza{ 107 string brand; 108 double diameter; 109 double weight; 110 }; 111 Pizza * p_pizza = new Pizza; 112 cout << "enter diameter: "; 113 cin >> p_pizza->diameter; cin.get(); 114 cout << "enter brand: "; 115 getline(cin, p_pizza->brand); 116 cout << "enter weight: "; 117 cin >> p_pizza->weight; 118 cout << "diameter: " << p_pizza->diameter << endl 119 << "brand: " << p_pizza->brand << endl 120 << "weight: " << p_pizza->weight << endl; 121 } 122 123 void ch4_9() { 124 using namespace std; 125 struct CandyBar{ 126 string brand; 127 double weight; 128 unsigned int kll; 129 }; 130 CandyBar * snack_arr = new CandyBar[3]; 131 snack_arr[0] = {"abc a", 34, 654}; 132 snack_arr[1] = {"abc b", 34580, 4363}; 133 snack_arr[2] = {"abc c", 756, 67}; 134 for (int i = 0; i < 3; ++ i) 135 cout << "brand: " << snack_arr[i].brand << endl 136 << "weight: " << snack_arr[i].weight << endl 137 << "kll: " << snack_arr[i].kll << endl; 138 } 139 140 void ch4_10() { 141 using namespace std; 142 array<double, 3> race; 143 for (int i = 0; i < 3; ++ i){ 144 cout << "race: "; 145 cin >> race[i]; 146 } 147 for (int i = 0; i < 3; ++ i) 148 cout << "#" << i + 1 << ": " << race[i] << endl; 149 }
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