{"id":7496,"date":"2022-09-09T01:35:30","date_gmt":"2022-09-08T20:05:30","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-pointer-keyword-in-fortran-equivalent-in-c-c\/"},"modified":"2022-09-09T01:35:30","modified_gmt":"2022-09-08T20:05:30","slug":"solved-pointer-keyword-in-fortran-equivalent-in-c-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-pointer-keyword-in-fortran-equivalent-in-c-c\/","title":{"rendered":"[Solved] POINTER keyword in FORTRAN equivalent in C\/C++"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-32755711\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"32755711\" data-parentid=\"32753030\" data-score=\"6\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>According to the above <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/www.sharcnet.ca\/help\/index.php\/Using_CRAY_POINTERS_in_a_FORTRAN_90_PROGRAM\">page<\/a>, the correspondence between Cray pointer and C pointer may be something like this (note, however, that Cray pointer is not the same as standardized pointer in modern Fortran).<\/p>\n<p>Fortran:<\/p>\n<pre><code>integer    a( 3 ), i\ninteger*8  ptr\npointer( ptr, b(*) ); integer b\n\na(:) = 10\nprint *, \"a = \", a( 1:3 )\n\nptr = loc( a(1) )    !! now b(i) becomes an alias of a(i) for i=1,2,3\nb( 2 ) = 30\n\nprint *, \"b = \", b( 1:3 )\nprint *, \"a = \", a( 1:3 )\n<\/code><\/pre>\n<p>C:<\/p>\n<pre><code>int i, a[ 3 ] = { 10, 10, 10 };\nint *ptr, *b;\n\nprintf( \"a = %d %d %d\\n\", a[0], a[1], a[2] );\n\nptr = &amp;( a[0] );   \/\/ &lt;--&gt; ptr = loc( a(1) ) in Fortran\nb = ptr;           \/\/ &lt;--&gt; pointer( ptr, b(*) ) in Fortran\n\nb[ 1 ] = 30;\n\nprintf( \"b = %d %d %d\\n\", b[0], b[1], b[2] );\nprintf( \"a = %d %d %d\\n\", a[0], a[1], a[2] );\n<\/code><\/pre>\n<p>Compile<\/p>\n<pre><code>gfortran -fcray-pointer test.f90\ngcc test.c\n\na = 10 10 10\nb = 10 30 10\na = 10 30 10\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">0<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved POINTER keyword in FORTRAN equivalent in C\/C++ <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] According to the above page, the correspondence between Cray pointer and C pointer may be something like this (note, however, that Cray pointer is not the same as standardized pointer in modern Fortran). Fortran: integer a( 3 ), i integer*8 ptr pointer( ptr, b(*) ); integer b a(:) = 10 print *, &#8220;a = &#8230; <a title=\"[Solved] POINTER keyword in FORTRAN equivalent in C\/C++\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-pointer-keyword-in-fortran-equivalent-in-c-c\/\" aria-label=\"More on [Solved] POINTER keyword in FORTRAN equivalent in C\/C++\">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":[324,1850],"class_list":["post-7496","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-fortran"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] POINTER keyword in FORTRAN equivalent in C\/C++ - 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-pointer-keyword-in-fortran-equivalent-in-c-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] POINTER keyword in FORTRAN equivalent in C\/C++ - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] According to the above page, the correspondence between Cray pointer and C pointer may be something like this (note, however, that Cray pointer is not the same as standardized pointer in modern Fortran). 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