{"id":734,"date":"2022-08-30T15:06:17","date_gmt":"2022-08-30T15:06:17","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/09\/problem-about-bit-shift-operators-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:06:17","modified_gmt":"2022-08-30T15:06:17","slug":"problem-about-bit-shift-operators-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/problem-about-bit-shift-operators-collection-of-common-programming-errors\/","title":{"rendered":"problem about bit-shift-operators-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/07a5275045173fc8aa44f7ffdaa7aea4?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\ncalccrypto<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/d5f91983a9d9cfb69981b6108a63b412?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nskaffman<br \/>\nc bit-shift-operators<br \/>\nI got the following code:int main(int argc, ch<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/UhzOM.jpg?s=32&amp;g=1\" \/><br \/>\nMaroun Maroun<br \/>\nc bit-shift-operators<br \/>\nThis question already has an answer here:Unexpected C\/C++ bitwise shift operators outcome5 answersOn Visual Studio compiling following C code , th<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/f2e5f9f5893bd92a1eaa3f55bc3c3055?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nQuantumMechanic<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/f81685ba2a5040485725e7e078d157b6?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJoshua<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/8515da15921aac9d159e55c1f62f9afb?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nM. Dudley<br \/>\nc++ undefined-behavior bit-shift-operators<br \/>\nI&#8217;m confused by something I read in the Shift Operators section of an article on undefined C++ behavior.On the ARM architecture, the shift operators always behave as if they take place in a 256-bit pattern space, regardless of the operand size&#8211;that is, the pattern repeats, or &#8220;wraps around&#8221;, only every 256 positions. Another way of thinking of this is that the pattern is shifted the specified number of posi<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/82f117d9f264e00191bbe7f10c96e4b4?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nrpg<br \/>\nc++ gcc c++11 bit-shift-operators<br \/>\nThe following code outputs 0,1,32,33. Which is counter intuitive to say the least. But if I replace the literal 1 with the type annonated constant &#8220;ONE&#8221;, the loop runs fine.This is with gcc 4.6.2 and -std=c++0x.#inclu<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/fc3025c472dc2f52f7b3f257f302c907?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nhaimg<br \/>\nc bit-shift-operators<br \/>\nLook at this sample C code (extracted a test case as an example):main() {unsigned long a, b;int c;c = 32;a =<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/297e728fc79110ee2ea25ccc69a8ffae?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJon Seigel<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/635c3ea0c7b8c37ef45744b6e66dd263?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nxtofl<br \/>\nc++ bit-shift-operators<br \/>\nI&#8217;m working with gcc 4.4.5, and have some difficulties in understanding the right shift operator on plain simple unsigned valu<\/li>\n<\/ul>\n<p id=\"rop\"><small>Originally posted 2013-11-09 21:44:41. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>calccrypto skaffman c bit-shift-operators I got the following code:int main(int argc, ch Maroun Maroun c bit-shift-operators This question already has an answer here:Unexpected C\/C++ bitwise shift operators outcome5 answersOn Visual Studio compiling following C code , th QuantumMechanic Joshua M. Dudley c++ undefined-behavior bit-shift-operators I&#8217;m confused by something I read in the Shift Operators section [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-734","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/734","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=734"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/734\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=734"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=734"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=734"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}