1. // brass.h -- bank account classes
  2. #ifndef BRASS_H_
  3. #define BRASS_H_
  4. #include <string>
  5. // Brass Account Class
  6. class Brass
  7. {
  8. private:
  9. std::string fullName;
  10. long acctNum;
  11. double balance;
  12. public:
  13. Brass(const std::string & s = "Nullbody", long an = -1,
  14. double bal = 0.0);
  15. void Deposit(double amt);
  16. virtual void Withdraw(double amt);
  17. double Balance() const;
  18. virtual void ViewAcct() const;
  19. virtual ~Brass() {}
  20. };
  22. //Brass Plus Account Class
  23. class BrassPlus : public Brass
  24. {
  25. private:
  26. double maxLoan;
  27. double rate;
  28. double owesBank;
  29. public:
  30. BrassPlus(const std::string & s = "Nullbody", long an = -1,
  31. double bal = 0.0, double ml = 500,
  32. double r = 0.11125);
  33. BrassPlus(const Brass & ba, double ml = 500,
  34. double r = 0.11125);
  35. virtual void ViewAcct()const;
  36. virtual void Withdraw(double amt);
  37. void ResetMax(double m) { maxLoan = m; }
  38. void ResetRate(double r) { rate = r; };
  39. void ResetOwes() { owesBank = 0; }
  40. };
  42. #endif
  45. // brass.cpp -- bank account class methods
  46. #include <iostream>
  47. #include "brass.h"
  48. using std::cout;
  49. using std::endl;
  50. using std::string;
  52. // formatting stuff
  53. typedef std::ios_base::fmtflags format;
  54. typedef std::streamsize precis;
  55. format setFormat();
  56. void restore(format f, precis p);
  58. // Brass methods
  60. Brass::Brass(const string & s, long an, double bal)
  61. {
  62. fullName = s;
  63. acctNum = an;
  64. balance = bal;
  65. }
  67. void Brass::Deposit(double amt)
  68. {
  69. if (amt < 0)
  70. cout << "Negative deposit not allowed; "
  71. << "deposit is cancelled.\n";
  72. else
  73. balance += amt;
  74. }
  76. void Brass::Withdraw(double amt)
  77. {
  78. // set up ###.## format
  79. format initialState = setFormat();
  80. precis prec = cout.precision(2);
  82. if (amt < 0)
  83. cout << "Withdrawal amount must be positive; "
  85. << "withdrawal canceled.\n";
  86. else if (amt <= balance)
  87. balance -= amt;
  88. else
  89. cout << "Withdrawal amount of $" << amt
  90. << " exceeds your balance.\n"
  91. << "Withdrawal canceled.\n";
  92. restore(initialState, prec);
  93. }
  94. double Brass::Balance() const
  95. {
  96. return balance;
  97. }
  99. void Brass::ViewAcct() const
  100. {
  101. // set up ###.## format
  102. format initialState = setFormat();
  103. precis prec = cout.precision(2);
  104. cout << "Client: " << fullName << endl;
  105. cout << "Account Number: " << acctNum << endl;
  106. cout << "Balance: $" << balance << endl;
  107. restore(initialState, prec); // Restore original format
  108. }
  110. // BrassPlus Methods
  111. BrassPlus::BrassPlus(const string & s, long an, double bal,
  112. double ml, double r) : Brass(s, an, bal)
  113. {
  114. maxLoan = ml;
  115. owesBank = 0.0;
  116. rate = r;
  117. }
  119. BrassPlus::BrassPlus(const Brass & ba, double ml, double r)
  120. : Brass(ba) // uses implicit copy constructor
  121. {
  122. maxLoan = ml;
  123. owesBank = 0.0;
  124. rate = r;
  125. }
  127. // redefine how ViewAcct() works
  128. void BrassPlus::ViewAcct() const
  129. {
  130. // set up ###.## format
  131. format initialState = setFormat();
  132. precis prec = cout.precision(2);
  134. Brass::ViewAcct(); // display base portion
  135. cout << "Maximum loan: $" << maxLoan << endl;
  136. cout << "Owed to bank: $" << owesBank << endl;
  137. cout.precision(3); // ###.### format
  138. cout << "Loan Rate: " << 100 * rate << "%\n";
  139. restore(initialState, prec);
  140. }
  142. // redefine how Withdraw() works
  143. void BrassPlus::Withdraw(double amt)
  144. {
  145. // set up ###.## format
  146. format initialState = setFormat();
  147. precis prec = cout.precision(2);
  149. double bal = Balance();
  150. if (amt <= bal)
  151. Brass::Withdraw(amt);
  152. else if ( amt <= bal + maxLoan - owesBank)
  153. {
  154. double advance = amt - bal;
  155. owesBank += advance * (1.0 + rate);
  156. cout << "Bank advance: $" << advance << endl;
  157. cout << "Finance charge: $" << advance * rate << endl;
  158. Deposit(advance);
  159. Brass::Withdraw(amt);
  160. }
  161. else
  162. cout << "Credit limit exceeded. Transaction cancelled.\n";
  163. restore(initialState, prec);
  164. }
  166. format setFormat()
  167. {
  168. // set up ###.## format
  169. return cout.setf(std::ios_base::fixed,
  170. std::ios_base::floatfield);
  171. }
  174. // usebrass2.cpp -- polymorphic example
  175. // compile with brass.cpp
  176. #include <iostream>
  177. #include <string>
  178. #include "brass.h"
  179. const int CLIENTS = 4;
  181. int main()
  182. {
  183. using std::cin;
  184. using std::cout;
  185. using std::endl;
  187. Brass * p_clients[CLIENTS];
  188. std::string temp;
  189. long tempnum;
  190. double tempbal;
  191. char kind;
  193. for (int i = 0; i < CLIENTS; i++)
  194. {
  195. cout << "Enter client's name: ";
  196. getline(cin,temp);
  197. cout << "Enter client's account number: ";
  198. cin >> tempnum;
  199. cout << "Enter opening balance: $";
  200. cin >> tempbal;
  201. cout << "Enter 1 for Brass Account or "
  202. << "2 for BrassPlus Account: ";
  203. while (cin >> kind && (kind != '1' && kind != '2'))
  204. cout <<"Enter either 1 or 2: ";
  205. if (kind == '1')
  206. p_clients[i] = new Brass(temp, tempnum, tempbal);
  207. else
  208. {
  209. double tmax, trate;
  210. cout << "Enter the overdraft limit: $";
  211. cin >> tmax;
  212. cout << "Enter the interest rate "
  213. << "as a decimal fraction: ";
  214. cin >> trate;
  215. p_clients[i] = new BrassPlus(temp, tempnum, tempbal,
  216. tmax, trate);
  217. }
  218. while (cin.get() != '\n')
  219. continue;
  220. }
  221. cout << endl;
  222. for (int i = 0; i < CLIENTS; i++)
  223. {
  224. p_clients[i]->ViewAcct();
  225. cout << endl;
  226. }
  228. for (int i = 0; i < CLIENTS; i++)
  229. {
  230. delete p_clients[i]; // free memory
  231. }
  232. cout << "Done.\n";
  233. /* code to keep window open
  234. if (!cin)
  235. cin.clear();
  236. while (cin.get() != '\n')
  237. continue;
  238. */
  239. return 0;
  240. }