Errors in Program

[PRUTHVI KANTH]

Question 1 (basic classes):
Consider the following code.

#include <iostream><br /> using namespace std;<br /> class Book {<br /> Book(int numPages);<br /> void SetPages(int numPages);<br /> int GetPages() const;<br /> private:<br /> int pages;<br /> }<br /> Book::Book(int numPages) {<br /> pages = numPages;<br /> }<br /> Book::SetPages(int numPages) {<br /> pages = numPages;<br /> }<br /> int Book::GetPages() {<br /> return pages;<br /> }<br /> int main() {<br /> Book textbook;<br /> textbook.SetPages(970);<br /> int numPages = textbook.GetPages();<br /> cout << "The textbook has " << numPages << " pages." << endl;<br /> int ripout = 5;<br /> textbook.SetPages(numPages - ripout);<br /> cout << "I just tore out " << ripout << " pages." << endl;<br /> cout << "It now has " << textbook.GetPages << " pages left." << endl;<br /> return 0;<br /> }</iostream>

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#include <iostream><br /> using namespace std;<br /> class Book {<br /> Book(int numPages);<br /> void SetPages(int numPages);<br /> int GetPages() const;<br /> private:<br /> int pages;<br /> }<br /> Book::Book(int numPages) {<br /> pages = numPages;<br /> }<br /> Book::SetPages(int numPages) {<br /> pages = numPages;<br /> }<br /> int Book::GetPages() {<br /> return pages;<br /> }<br /> int main() {<br /> Book textbook;<br /> textbook.SetPages(970);<br /> int numPages = textbook.GetPages();<br /> cout << "The textbook has " << numPages << " pages." << endl;<br /> int ripout = 5;<br /> textbook.SetPages(numPages - ripout);<br /> cout << "I just tore out " << ripout << " pages." << endl;<br /> cout << "It now has " << textbook.GetPages << " pages left." << endl;<br /> return 0;<br /> }</iostream>

What errors are in this code? (There are at least 5.)

[S.Thananchayan]

Ewwww thats got problems try this
 

#include <iostream><br /> template<class B1, class B2><br /> class MyBook {<br />  B1 book1;<br />  B2 book2;<br /> public:<br />  MyBook(B1 b1, B2 b2) : book1(b1), book2(b2)<br />      {  }<br />  template</class><class B3, class B4><br />  friend std::ostream&#038; operator<<(std::ostream&#038; os,<br />                                  const MyBook<B3, B4>&#038;);<br /> };<br /> template</class><class B1, class B2><br /> std::ostream&#038; operator<<(std::ostream&#038; os,<br />                          const MyBook<B1, B2>&#038; bb)<br /> {<br />  std::cout<<"My book has " << bb.book1 << ' ' << "pages" << std::endl;<br />  std::cout<<"I just tore out " << bb.book1 - bb.book2 << ' ' << "pages" << std::endl;<br />  std::cout<<"My book now has " << bb.book2 << ' ' << "pages" << std::endl;<br />  return os;<br /> }<br /> int main()<br /> {<br />  int a = 970;<br />  int b = 965;<br />  MyBook<int,double> my_twothings(a, b);<br />  std::cout << my_twothings << std::endl;<br />  return 0;<br /> }</class></iostream>

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#include <iostream><br /> template<class B1, class B2><br /> class MyBook {<br />  B1 book1;<br />  B2 book2;<br /> public:<br />  MyBook(B1 b1, B2 b2) : book1(b1), book2(b2)<br />      {  }<br />  template</class><class B3, class B4><br />  friend std::ostream&#038; operator<<(std::ostream&#038; os,<br />                                  const MyBook<B3, B4>&#038;);<br /> };<br /> template</class><class B1, class B2><br /> std::ostream&#038; operator<<(std::ostream&#038; os,<br />                          const MyBook<B1, B2>&#038; bb)<br /> {<br />  std::cout<<"My book has " << bb.book1 << ' ' << "pages" << std::endl;<br />  std::cout<<"I just tore out " << bb.book1 - bb.book2 << ' ' << "pages" << std::endl;<br />  std::cout<<"My book now has " << bb.book2 << ' ' << "pages" << std::endl;<br />  return os;<br /> }<br /> int main()<br /> {<br />  int a = 970;<br />  int b = 965;<br />  MyBook<int,double> my_twothings(a, b);<br />  std::cout << my_twothings << std::endl;<br />  return 0;<br /> }</class></iostream>

[PRUTHVI KANTH]

You are great :)

[S.Thananchayan]

Thanks~
That idea came from Al Stevens.
I just changed some of it.

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