{"id":24973,"date":"2022-12-07T01:49:36","date_gmt":"2022-12-06T20:19:36","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-cpp-linked-list-programerror-in-display-closed\/"},"modified":"2022-12-07T01:49:36","modified_gmt":"2022-12-06T20:19:36","slug":"solved-cpp-linked-list-programerror-in-display-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-cpp-linked-list-programerror-in-display-closed\/","title":{"rendered":"[Solved] cpp linked list program:error in display [closed]"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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You never assign an initial node. This is the kind of problem that a sheet of paper, a pencil, and two minutes of drawing arrows and boxes should solve, and until you’re fluent<\/strong> in dynamic allocation get used to doing a lot<\/em> of that. <\/p>\n

This:<\/p>\n

if(start==NULL)\n{\n    p->next=NULL;\n    p->prev=NULL;\n    \/\/ NOTE: start is still NULL\n}\nelse\n{\n    p->next=start;\n    p->prev=NULL;\n    p->next->prev=p;\n    start=p;\n}\n<\/code><\/pre>\n
should be this:<\/p>\n
if(start==NULL)\n{\n    p->next=NULL;\n    p->prev=NULL;\n}\nelse\n{\n    p->next=start;\n    p->prev=NULL;\n    p->next->prev=p;\n}\nstart=p; \/\/ NOTE: start always references the last node allocated.\n<\/code><\/pre>\n
But it is worth noting that the constructor for node<\/code> already sets your member pointers next<\/code> and prev<\/code> to NULL<\/code>. Therefore the above code is further reducible to simply :<\/p>\n
if (start != NULL)\n{\n    p->next=start;\n    start->prev=p;\n}\nstart=p;\n<\/code><\/pre>\n
\n
That said, the real solution is std::list<int><\/code> or std:vector<int><\/code>, but I suppose you have to start somewhere. Best of luck.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            1<\/span> <\/p><\/div>\n<\/div>\n
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solved cpp linked list program:error in display [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] You never assign an initial node. This is the kind of problem that a sheet of paper, a pencil, and two minutes of drawing arrows and boxes should solve, and until you’re fluent in dynamic allocation get used to doing a lot of that. This: if(start==NULL) { p->next=NULL; p->prev=NULL; \/\/ NOTE: start is still … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,547],"class_list":["post-24973","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-oop"],"yoast_head":"\n[Solved] cpp linked list program:error in display [closed] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-cpp-linked-list-programerror-in-display-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] cpp linked list program:error in display [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You never assign an initial node. This is the kind of problem that a sheet of paper, a pencil, and two minutes of drawing arrows and boxes should solve, and until you’re fluent in dynamic allocation get used to doing a lot of that. This: if(start==NULL) { p->next=NULL; p->prev=NULL; \/\/ NOTE: start is still ... 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This is the kind of problem that a sheet of paper, a pencil, and two minutes of drawing arrows and boxes should solve, and until you’re fluent in dynamic allocation get used to doing a lot of that. This: if(start==NULL) { p->next=NULL; p->prev=NULL; \/\/ NOTE: start is still ... 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