{"id":19751,"date":"2022-11-07T15:50:45","date_gmt":"2022-11-07T10:20:45","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/"},"modified":"2022-11-07T15:50:45","modified_gmt":"2022-11-07T10:20:45","slug":"solved-please-explain-the-output-to-this-code-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/","title":{"rendered":"[Solved] Please explain the output to this code: [closed]"},"content":{"rendered":"

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

\n
\n
<\/div>\n
\n
\n

This is a trick question. Presumably someone thought you could learn something from it. Presumably this person also thinks that a good way to teach a child to ride a bicycle is to flatten the bicycle’s tires, and put large boulders in the way, and randomly give the child a rough shove to the side, because it “builds character”, and if you can learn to ride a bicycle in spite of those obstacles, you will eventually be a really good bike rider. But I digress.<\/p>\n

Anyway, here’s an explanation of what’s going on in that code.<\/p>\n

0xA<\/code> is a hexadecimal constant. It has the value 0A16<\/sub>, or 10 (base 10).
052<\/code> is an octal constant. It has the value 528<\/sub>, or 42 (base 10).
'\\xeb'<\/code> is a hexadecimal character constant. It is a character with the value EB16<\/sub>, or 235 (base 10) (which in ISO-8859-1 or Unicode ends up being an e with two dots over it, \u00eb).
'\\012'<\/code> is an ordinary, octal character constant. It is a character with the value 128<\/sub>, or 10 (base 10) (which in ASCII ends up being a newline character, '\\n'<\/code>).<\/p>\n

When you say<\/p>\n

if( expr )\n<\/code><\/pre>\n
in C, the expression is considered “true” if it is nonzero, or “false” if it is zero.  Needless to say, all four of those constants are nonzero.<\/p>\n
The full syntax of an if<\/code> statement in C is either<\/p>\n
if( expr )\n    statement-or-block\n<\/code><\/pre>\n
or<\/p>\n
if( expr )\n    statement-or-block\nelse\n    statement-or-block\n<\/code><\/pre>\n
where statement-or-block<\/code> is either a single statement, or a “block” (sequence) of multiple statements enclodes in braces { }<\/code>.<\/p>\n
A little-used piece of syntax in C is the “empty statement”.  If you have nothing, followed by a semicolon, that’s an empty statement, and it does… nothing.<\/p>\n
It is considered mandatory in polite circles to indent your code to portray its structure.  So the normal way of presenting this code would be:<\/p>\n
#include <stdio.h>\n\nint main()\n{\n    if(0xA)\n        if(052)              \n            if('\\xeb')\n                if('\\012')\n                    printf(\"Hello World!\")\n                else\n                    ;\n            else\n                ;\n        else\n            ;\n    else\n        ;\n}\n<\/code><\/pre>\n
And, again, all four expressions evaluate immediately to “true”.  So, in English, this code says “If true, then if true, then if true, then if true, then print ‘Hello world!’, else do nothing, else do nothing, else do nothing, else do nothing.”<\/p>\n
Phrased that way it sounds pretty stupid, I know.  And in fact, it’s just as stupid in C as it is in English.<\/p>\n
P.S. Besides the bizarre and unnecessary conditionals, another problem with the code as posted, which I have quietly corrected, is that it declared main<\/code> as void<\/code>, which is something else that’s not done in polite circles, and throws further doubt on the validity of the book this code came from.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            <\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Please explain the output to this code: [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This is a trick question. Presumably someone thought you could learn something from it. Presumably this person also thinks that a good way to teach a child to ride a bicycle is to flatten the bicycle’s tires, and put large boulders in the way, and randomly give the child a rough shove to the … 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":[324,639],"class_list":["post-19751","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-if-statement"],"yoast_head":"\n[Solved] Please explain the output to this code: [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-please-explain-the-output-to-this-code-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Please explain the output to this code: [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This is a trick question. Presumably someone thought you could learn something from it. Presumably this person also thinks that a good way to teach a child to ride a bicycle is to flatten the bicycle’s tires, and put large boulders in the way, and randomly give the child a rough shove to the ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-07T10:20:45+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Please explain the output to this code: [closed]\",\"datePublished\":\"2022-11-07T10:20:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\"},\"wordCount\":421,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"c++\",\"if-statement\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\",\"name\":\"[Solved] Please explain the output to this code: [closed] - JassWeb\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#website\"},\"datePublished\":\"2022-11-07T10:20:45+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/jassweb.com\/solved\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"[Solved] Please explain the output to this code: [closed]\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jassweb.com\/solved\/#website\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"name\":\"JassWeb\",\"description\":\"Build High-quality Websites\",\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/jassweb.com\/solved\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\",\"name\":\"Jass Web\",\"url\":\"https:\/\/jassweb.com\/solved\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"contentUrl\":\"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png\",\"width\":693,\"height\":132,\"caption\":\"Jass Web\"},\"image\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\",\"name\":\"Kirat\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"contentUrl\":\"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586\",\"caption\":\"Kirat\"},\"sameAs\":[\"http:\/\/jassweb.com\"],\"url\":\"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"[Solved] Please explain the output to this code: [closed] - JassWeb","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/","og_locale":"en_US","og_type":"article","og_title":"[Solved] Please explain the output to this code: [closed] - JassWeb","og_description":"[ad_1] This is a trick question. Presumably someone thought you could learn something from it. Presumably this person also thinks that a good way to teach a child to ride a bicycle is to flatten the bicycle’s tires, and put large boulders in the way, and randomly give the child a rough shove to the ... Read more","og_url":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/","og_site_name":"JassWeb","article_published_time":"2022-11-07T10:20:45+00:00","author":"Kirat","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Kirat","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#article","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/"},"author":{"name":"Kirat","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31"},"headline":"[Solved] Please explain the output to this code: [closed]","datePublished":"2022-11-07T10:20:45+00:00","mainEntityOfPage":{"@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/"},"wordCount":421,"publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"keywords":["c++","if-statement"],"articleSection":["Solved"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/","url":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/","name":"[Solved] Please explain the output to this code: [closed] - JassWeb","isPartOf":{"@id":"https:\/\/jassweb.com\/solved\/#website"},"datePublished":"2022-11-07T10:20:45+00:00","breadcrumb":{"@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/jassweb.com\/solved\/solved-please-explain-the-output-to-this-code-closed\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/jassweb.com\/solved\/"},{"@type":"ListItem","position":2,"name":"[Solved] Please explain the output to this code: [closed]"}]},{"@type":"WebSite","@id":"https:\/\/jassweb.com\/solved\/#website","url":"https:\/\/jassweb.com\/solved\/","name":"JassWeb","description":"Build High-quality Websites","publisher":{"@id":"https:\/\/jassweb.com\/solved\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/jassweb.com\/solved\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/jassweb.com\/solved\/#organization","name":"Jass Web","url":"https:\/\/jassweb.com\/solved\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/","url":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","contentUrl":"https:\/\/jassweb.com\/wp-content\/uploads\/2021\/02\/jass-website-logo-1.png","width":693,"height":132,"caption":"Jass Web"},"image":{"@id":"https:\/\/jassweb.com\/solved\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31","name":"Kirat","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/jassweb.com\/solved\/#\/schema\/person\/image\/","url":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","contentUrl":"https:\/\/jassweb.com\/solved\/wp-content\/litespeed\/avatar\/1261af3c9451399fa1336d28b98ea3bb.jpg?ver=1776403586","caption":"Kirat"},"sameAs":["http:\/\/jassweb.com"],"url":"https:\/\/jassweb.com\/solved\/author\/jaspritsinghghumangmail-com\/"}]}},"_links":{"self":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/19751","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/comments?post=19751"}],"version-history":[{"count":0,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/posts\/19751\/revisions"}],"wp:attachment":[{"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/media?parent=19751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/categories?post=19751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jassweb.com\/solved\/wp-json\/wp\/v2\/tags?post=19751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}