1 void ch6_1() { 2 using namespace std; 3 char ch; 4 while ((ch = cin.get()) != '@') { 5 if (isdigit(ch)) 6 continue; 7 else if (islower(ch)) 8 ch = toupper(ch); 9 else if (isupper(ch)) 10 ch = tolower(ch); 11 cout << ch; 12 } 13 } 14 15 void ch6_2() { 16 using namespace std; 17 const unsigned int ArrSize = 10; 18 double donations[ArrSize]{0}; 19 double average{0}; 20 unsigned int overcount{0}; 21 cout << "enter 10 donations in double: " << endl; 22 for (int i = 0; i < ArrSize; ++ i) { 23 while (!(cin >> donations[i])) { 24 cin.clear(); 25 while (cin.get() != '\n') 26 continue; 27 cout << "must enter a double: "; 28 } 29 } 30 for (int i = 0; i < ArrSize; ++ i) 31 average += donations[i]; 32 average /= ArrSize; 33 for (int i = 0; i < ArrSize; ++ i) 34 if (donations[i] > average) 35 ++ overcount; 36 cout << "average donation: " << average << endl; 37 cout << overcount << " donations above average" << endl; 38 } 39 40 void ch6_3() { 41 using namespace std; 42 char ch; 43 cout << "Please enter one of the following choices: " << endl; 44 cout << "c) carnivore \t p) pianist" << endl; 45 cout << "t) tree \t g) game" << endl; 46 bool loop = true; 47 while (loop) { 48 cin >> ch; 49 switch (ch) { 50 case 'c': 51 cout << "carnivore" << endl; 52 loop = false; 53 break; 54 case 'p': 55 cout << "pianist" << endl; 56 loop = false; 57 break; 58 case 't': 59 cout << "tree" << endl; 60 loop = false; 61 break; 62 case 'g': 63 cout << "game" << endl; 64 loop = false; 65 break; 66 default: 67 cout << "Please enter a c, p, t, or g: "; 68 break; 69 } 70 } 71 } 72 73 void ch6_4() { 74 using namespace std; 75 const int strsize = 100; 76 struct bop { 77 char fullname[strsize]; 78 char title[strsize]; 79 char bopname[strsize]; 80 int preference; // 0 = fullname, 1 = title, 2 = bopname 81 }; 82 const int ArSize = 3; 83 bop member[ArSize] = { 84 {"fullname1", "title1", "bopname1", 3}, 85 {"fullname2", "title2", "bopname2", 2}, 86 {"fullname3", "title3", "bopname3", 1} 87 }; 88 bool loop = true; 89 char ch; 90 cout << "Benevolent Order of Programmers Report" << endl 91 << "a. display by name \t b. display by title" << endl 92 << "c. display by bopname \t b. display by preference" << endl 93 << "q. quit" << endl; 94 while (loop) { 95 cout << "Enter your choice: "; 96 cin >> ch; 97 switch (ch) { 98 case 'a': 99 for (int i = 0; i < ArSize; ++ i) 100 cout << member[i].fullname << endl; 101 break; 102 case 'b': 103 for (int i = 0; i < ArSize; ++ i) 104 cout << member[i].title << endl; 105 break; 106 case 'c': 107 for (int i = 0; i < ArSize; ++ i) 108 cout << member[i].bopname << endl; 109 break; 110 case 'd': 111 for (int i = 0; i < ArSize; ++ i) { 112 if (member[i].preference == 1) 113 cout << member[i].fullname << endl; 114 else if (member[i].preference == 2) 115 cout << member[i].title << endl; 116 else 117 cout << member[i].bopname << endl; 118 } 119 break; 120 case 'q': 121 loop = false; 122 default: 123 cout << "enter a, b, c, d, or q: "; 124 break; 125 } 126 } 127 } 128 129 void ch6_5() { 130 using namespace std; 131 unsigned int salary{0}; 132 double tax{0}; 133 while (true) { 134 cout << "enter your salary: "; 135 if (!(cin >> salary)) { 136 cout << "invalid input!" << endl; 137 break; 138 } 139 if (salary <= 5000) 140 tax = 0; 141 else if (salary > 5000 && salary <= 15000) 142 tax = (salary - 5000) * 0.1; 143 else if (salary > 15000 && salary <= 35000) 144 tax = 10000 * 0.1 + (salary - 15000) * 0.15; 145 else 146 tax = 10000 * 0.1 + 20000 * 0.15 + (salary - 35000) * 0.2; 147 cout << "tax: " << tax << endl; 148 } 149 150 } 151 152 void ch6_6() { 153 using namespace std; 154 struct donator { 155 string name; 156 double amount; 157 }; 158 unsigned int donum{0}; 159 cout << "enter number of donators: "; 160 while (!(cin >> donum)) { 161 cin.clear(); 162 while (cin.get() != '\n') 163 continue; 164 cout << "enter a number: "; 165 } 166 cin.get(); 167 donator * donator_arr = new donator[donum]; 168 cout << "enter name and amount for each donator" << endl; 169 for (int i = 0; i < donum; ++ i) { 170 cout << "#" << i + 1 << " name: "; 171 getline(cin, donator_arr[i].name); 172 cout << "#" << i + 1 << " amount: "; 173 while (!(cin >> donator_arr[i].amount)) { 174 cin.clear(); 175 while (cin.get() != '\n') 176 continue; 177 cout << "enter a number: "; 178 } 179 cin.get(); 180 } 181 bool grand{false}, normal{false}; 182 cout << endl << "Grand Patrons: " << endl; 183 for (int i = 0; i < donum; ++ i) 184 if (donator_arr[i].amount >= 10000) { 185 grand = true; 186 cout << donator_arr[i].name << ": " << donator_arr[i].amount << endl; 187 } 188 if (!grand) 189 cout << "None!" << endl; 190 cout << endl << "Other Patrons: " << endl; 191 for (int i = 0; i < donum; ++ i) 192 if (donator_arr[i].amount < 10000) { 193 normal = true; 194 cout << donator_arr[i].name << ": " << donator_arr[i].amount << endl; 195 } 196 if (!normal) 197 cout << "None!" << endl; 198 } 199 200 void ch6_7() { 201 using namespace std; 202 string word; 203 int vowels{0}, consonant{0}, other{0}; 204 cout << "Enter words (q to quit): " << endl; 205 cin >> word; 206 while (word != "q") { 207 if (isalpha(word[0])) { 208 switch (word[0]) { 209 case 'a': 210 case 'e': 211 case 'i': 212 case 'o': 213 case 'u': 214 ++ vowels; 215 break; 216 default: 217 ++ consonant; 218 break; 219 } 220 } 221 else 222 ++ other; 223 cin >> word; 224 } 225 cout << vowels << " words beginning with vowels" << endl 226 << consonant << " words beginning with consonants" << endl 227 << other << " others" << endl; 228 } 229 230 void ch6_8() { 231 using namespace std; 232 const string FILENAME = "../C++PrimerPlus/testfiles/test.txt"; 233 ifstream InFile; 234 InFile.open(FILENAME); 235 if (!InFile.is_open()) { 236 cout << "file not found" << endl; 237 return; 238 } 239 unsigned int count{0}; 240 char ch; 241 while ((ch = InFile.get()) != EOF) 242 ++ count; 243 InFile.close(); 244 cout << count << " chars in this file" << endl; 245 } 246 247 void ch6_9() { 248 using namespace std; 249 struct donator { 250 string name; 251 double amount; 252 }; 253 const string FILENAME = "../C++PrimerPlus/testfiles/patrons.txt"; 254 ifstream InFile; 255 InFile.open(FILENAME); 256 if (!InFile.is_open()) { 257 cout << "file not found" << endl; 258 return; 259 } 260 unsigned int donum{0}; 261 InFile >> donum; InFile.get(); 262 donator * donator_arr = new donator[donum]; 263 for (int i = 0; i < donum; ++ i) { 264 getline(InFile, donator_arr[i].name); 265 InFile >> donator_arr[i].amount; 266 InFile.get(); 267 } 268 InFile.close(); 269 bool grand{false}, normal{false}; 270 cout << endl << "Grand Patrons: " << endl; 271 for (int i = 0; i < donum; ++ i) 272 if (donator_arr[i].amount >= 10000) { 273 grand = true; 274 cout << donator_arr[i].name << ": " << donator_arr[i].amount << endl; 275 } 276 if (!grand) 277 cout << "None!" << endl; 278 cout << endl << "Other Patrons: " << endl; 279 for (int i = 0; i < donum; ++ i) 280 if (donator_arr[i].amount < 10000) { 281 normal = true; 282 cout << donator_arr[i].name << ": " << donator_arr[i].amount << endl; 283 } 284 if (!normal) 285 cout << "None!" << endl; 286 }
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標籤：C++