Comparisons between classes are different compared to local variables e.g. int(eger), float, doubles.. because the comparisons aspects of the standard variables have already been done e.g. <\/p>\n
\r\nint a=2;\r\nint b =3;\r\nif (a==b)....\r\n<\/pre>\nthe comparison being the “==”, within your own classes if you want to test against a another object that is of the same class you will have to write a comparison function that will either return true or false, of course there are other comparisons <,>, <=, >= etc and also +,- which can be implemented if you wanted to.<\/p>\n
The basics of the comparison operator is <\/p>\n
\r\nbool operator == (const yourclassname &tester)\r\n<\/pre>\nwhere yourclassname is what you have called your class, of course you can run comparisons with other classes and also standard variables like floats, but you will need to write a separate one for each. The operator is the keyword, and it returns a bool(ean) result which is either true\/false, so once you have done a comparison within this function you just return either true or false and the code below will still compile<\/p>\n
\r\nclassA a;\r\nclassA b;\r\nif (a==b) .. \r\n<\/pre>\nbelow is code that you can compile to demonstrate operator keyword abit more.<\/p>\n
\r\n#include \r\n\r\nusing namespace std;\r\n\r\nclass classA\r\n{\r\n public : \r\n int x;\r\n \r\n \/\/ of course you cannot alter the testing class so const \r\n \/\/ the tester is the right hand side of the boolean test e.g.\r\n \/\/ if (A == B ) . A = this class and B = tester\r\n bool operator == (const classA &tester)\r\n {\r\n if (x == tester.x) \r\n\treturn true; \r\n else \r\n\treturn false;\r\n };\r\n};\r\n\r\nint main()\r\n{\r\n classA a;\r\n classA b;\r\n a.x = 0;\r\n b.x = 0;\r\n \r\n if (a==b)\r\n cout << \"the same\" << endl;\r\n else\r\n cout << \"not the same\" << endl;\r\n \r\n b.x = 1;\r\n\r\n if (a==b)\r\n cout << \"the same\" << endl;\r\n else\r\n cout << \"not the same\" << endl;\r\n\r\n return 0;\r\n}\r\n<\/pre>\nand the output would be<\/p>\n
\r\nthe same\r\nnot the same\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"Comparisons between classes are different compared to local variables e.g. int(eger), float, doubles.. because the comparisons aspects of the standard variables have already been done e.g. int a=2; int b =3; if (a==b)…. the comparison being the “==”, within your own classes if you want to test against a another object that is of the … Continue reading operator – comparisons<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[122,109],"class_list":["post-753","post","type-post","status-publish","format-standard","hentry","category-c_and_cpp","tag-122","tag-operator"],"_links":{"self":[{"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/posts\/753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/comments?post=753"}],"version-history":[{"count":2,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/posts\/753\/revisions"}],"predecessor-version":[{"id":758,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/posts\/753\/revisions\/758"}],"wp:attachment":[{"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/media?parent=753"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/categories?post=753"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codingfriends.com\/index.php\/wp-json\/wp\/v2\/tags?post=753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}