{"id":3533,"date":"2011-01-25T10:35:00","date_gmt":"2011-01-25T10:35:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/vcblog\/2011\/01\/25\/sharing-the-heritage-quiz-game\/"},"modified":"2019-02-18T18:45:17","modified_gmt":"2019-02-18T18:45:17","slug":"sharing-the-heritage-quiz-game","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/cppblog\/sharing-the-heritage-quiz-game\/","title":{"rendered":"Sharing the Heritage (Quiz Game)"},"content":{"rendered":"

I was reading recent discussion threads and found something interesting that someone introduced as a question, but instead of start developing the whole story from here, I’ll just challenge you with two different quiz games.<\/p>\n

\n
\n
Quiz 1<\/div>\n
\n
    \n
  1. #include<\/span> <iostream><\/span><\/li>\n
  2.  <\/li>\n
  3. class<\/span> Foo {<\/li>\n
  4. public<\/span>:<\/li>\n
  5.     virtual<\/span> void<\/span> DoStuff()=0;<\/li>\n
  6. };<\/li>\n
  7.  <\/li>\n
  8. class<\/span> Bar : public<\/span> Foo {<\/li>\n
  9. public<\/span>:<\/li>\n
  10.     virtual<\/span> void<\/span> DoStuff(int<\/span> a)=0;<\/li>\n
  11. };<\/li>\n
  12.  <\/li>\n
  13. class<\/span> Baz : public<\/span> Bar {<\/li>\n
  14. public<\/span>:<\/li>\n
  15.     void<\/span> DoStuff(int<\/span> a) override<\/span><\/li>\n
  16.     {<\/li>\n
  17.         std::cout << “Baz::DoStuff(int)”<\/span>;<\/li>\n
  18.     }<\/li>\n
  19.  <\/li>\n
  20.     void<\/span> DoStuff() override<\/span><\/li>\n
  21.     {<\/li>\n
  22.         std::cout << “Baz::DoStuff()”<\/span>;<\/li>\n
  23.     }<\/li>\n
  24. };<\/li>\n
  25.  <\/li>\n
  26. int<\/span> main() {<\/li>\n
  27.     Baz baz;<\/li>\n
  28.     Bar *pBar = &baz;<\/li>\n
  29.  <\/li>\n
  30.     pBar->DoStuff();<\/li>\n
  31. }<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n

    Without using Visual Studio or your building tool of preference, just your knowledge, if we tried to run this code, what is expected to see in the console? Why?<\/p>\n

    Now let’s make a little variation and substitute the method getting no arguments for one getting char, as follows:<\/p>\n

    \n
    \n
    Quiz 2<\/div>\n
    \n
      \n
    1. #include<\/span> <iostream><\/span><\/li>\n
    2.  <\/li>\n
    3. class<\/span> Foo {<\/li>\n
    4. public<\/span>:<\/li>\n
    5.     virtual<\/span> void<\/span> DoStuff(char<\/span> a)=0;<\/li>\n
    6. };<\/li>\n
    7.  <\/li>\n
    8. class<\/span> Bar : public<\/span> Foo {<\/li>\n
    9. public<\/span>:<\/li>\n
    10.     virtual<\/span> void<\/span> DoStuff(int<\/span> a)=0;<\/li>\n
    11. };<\/li>\n
    12.  <\/li>\n
    13. class<\/span> Baz : public<\/span> Bar {<\/li>\n
    14. public<\/span>:<\/li>\n
    15.     void<\/span> DoStuff(int<\/span> a) override<\/span><\/li>\n
    16.     {<\/li>\n
    17.         std::cout << “Baz::DoStuff(int)”<\/span>;<\/li>\n
    18.     }<\/li>\n
    19.  <\/li>\n
    20.     void<\/span> DoStuff(char<\/span> a) override<\/span><\/li>\n
    21.     {<\/li>\n
    22.         std::cout << “Baz::DoStuff(char)”<\/span>;<\/li>\n
    23.     }<\/li>\n
    24. };<\/li>\n
    25.  <\/li>\n
    26. int<\/span> main() {<\/li>\n
    27.     Baz baz;<\/li>\n
    28.     Bar *pBar = &baz;<\/li>\n
    29.  <\/li>\n
    30.     pBar->DoStuff(‘a’<\/span>);<\/li>\n
    31. }<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n

      If we ran this new version, provided that it compiles with no errors, what is expected to be seen in the output console? Why?<\/p>\n

       <\/p>\n

      Solutions are explained in this sequel<\/a>.<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

      I was reading recent discussion threads and found something interesting that someone introduced as a question, but instead of start developing the whole story from here, I’ll just challenge you with two different quiz games. Quiz 1 #include <iostream>   class Foo { public:     virtual void DoStuff()=0; };   class Bar : public Foo { public: […]<\/p>\n","protected":false},"author":293,"featured_media":35994,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[100],"class_list":["post-3533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cplusplus","tag-c-language"],"acf":[],"blog_post_summary":"

      I was reading recent discussion threads and found something interesting that someone introduced as a question, but instead of start developing the whole story from here, I’ll just challenge you with two different quiz games. Quiz 1 #include <iostream>   class Foo { public:     virtual void DoStuff()=0; };   class Bar : public Foo { public: […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/3533","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/users\/293"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/comments?post=3533"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/posts\/3533\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media\/35994"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/media?parent=3533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/categories?post=3533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/cppblog\/wp-json\/wp\/v2\/tags?post=3533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}