{"id":2460,"date":"2015-05-02T21:36:00","date_gmt":"2015-05-02T19:36:00","guid":{"rendered":"http:\/\/www.valcon.it\/pp\/?p=2460"},"modified":"2025-07-20T16:18:01","modified_gmt":"2025-07-20T14:18:01","slug":"numeri-interi-2","status":"publish","type":"post","link":"https:\/\/www.valcon.it\/pp\/numeri-interi-2\/","title":{"rendered":"Numeri interi"},"content":{"rendered":"\n<p>Nella pratica della programmazione compaiono interi<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>senza segno \/ con segno<\/li>\n\n\n\n<li>che occupano 1 \/ 2 \/ 4 \/ 8 byte<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Senza segno<\/h2>\n\n\n\n<p>I numeri interi senza segno sono rappresentati internamente in binario assoluto<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"># byte<\/th><th class=\"has-text-align-center\" data-align=\"center\"># bit<\/th><th class=\"has-text-align-center\" data-align=\"center\">Valore minimo<\/th><th class=\"has-text-align-center\" data-align=\"center\">Valore massimo<\/th><th><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>1<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>8<\/strong><\/sup> &#8211; 1<\/td><td>= 255<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>2<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">16<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>16<\/strong><\/sup> &#8211; 1<\/td><td>= 65.535<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>4<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">32<\/td><td class=\"has-text-align-center\" data-align=\"center\">0<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>32<\/strong><\/sup> &#8211; 1<\/td><td>= 4.294.967.295<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nei linguaggi?<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"># byte<\/th><th>C<\/th><th>C++<\/th><th>Java<\/th><th>Python<\/th><th>TP 6<\/th><th>VB 6<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>1<\/strong><\/td><td>?<\/td><td>?<\/td><td><\/td><td><\/td><td><code>Byte<\/code><\/td><td><code>Byte<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>2<\/strong><\/td><td>?<\/td><td>?<\/td><td><\/td><td><\/td><td><code>Word<\/code><\/td><td><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>4<\/strong><\/td><td><code>unsigned long int<\/code><\/td><td>?<\/td><td><\/td><td><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Note<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C, C++: dipende dalla piattaforma<\/li>\n\n\n\n<li>Java, Python: non ci sono interi senza segno.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Con segno<\/h2>\n\n\n\n<p>La rappresentazione interna \u00e8 in <strong>complemento a 2<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"># byte<\/th><th class=\"has-text-align-center\" data-align=\"center\"># bit<\/th><th class=\"has-text-align-center\" data-align=\"center\">Valore minimo<\/th><th><\/th><th class=\"has-text-align-center\" data-align=\"center\">Valore massimo<\/th><th><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>1<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">8<\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>&#8211;<\/strong>2<sup><strong>7<\/strong><\/sup><\/td><td>= -128<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>7<\/strong><\/sup> &#8211; 1<\/td><td>= 127<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>2<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">16<\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>&#8211;<\/strong>2<sup><strong>15<\/strong><\/sup><\/td><td>= -32.768<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>15<\/strong><\/sup> &#8211; 1<\/td><td>= 32.767<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>4<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">32<\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>&#8211;<\/strong>2<sup><strong>31<\/strong><\/sup><\/td><td>= -2.147.483.648<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>31<\/strong><\/sup> &#8211; 1<\/td><td>= 2.147.483.647<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>8<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">64<\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>&#8211;<\/strong>2<sup><strong>63<\/strong><\/sup><\/td><td>= -9.223.372.036.854.775.808<\/td><td class=\"has-text-align-center\" data-align=\"center\">2<sup><strong>63<\/strong><\/sup> &#8211; 1<\/td><td>= 9.223.372.036.854.775.807<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nei linguaggi?<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\"># byte<\/th><th>C<\/th><th>C++<\/th><th>Java<\/th><th>Python<\/th><th>TP 6<\/th><th>VB 6<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>1<\/strong><\/td><td>?<\/td><td>?<\/td><td><code>byte<\/code><\/td><td><\/td><td><code>ShortInt<\/code><\/td><td><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>2<\/strong><\/td><td>?<\/td><td>?<\/td><td><code>short<\/code><\/td><td><\/td><td><code>Integer<\/code><\/td><td><code>Integer<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>4<\/strong><\/td><td><code>long int<\/code><\/td><td>?<\/td><td><code>int<\/code><\/td><td><\/td><td><code>LongInt<\/code><\/td><td><code>Long<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>8<\/strong><\/td><td><\/td><td><\/td><td><code>long<\/code><\/td><td><\/td><td><code>Comp<\/code><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Note<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>C, C++: utilizzano interi che dipendono dalla piattaforma<\/li>\n\n\n\n<li>Java utilizza interi <strong>con segno<\/strong> che <strong>non<\/strong> dipendono dalla piattaforma<\/li>\n\n\n\n<li>Python utilizza interi <strong>con segno<\/strong> che <strong>non<\/strong> dipendono dalla piattaforma, <em>con precisione infinita<\/em>.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Nella pratica della programmazione compaiono interi Senza segno I numeri interi senza segno sono rappresentati internamente in binario assoluto # byte # bit Valore minimo Valore massimo 1 8 0 28 &#8211; 1 = 255 2 16 0 216 &#8211; 1 = 65.535 4 32 0 232 &#8211; 1 = 4.294.967.295 Nei linguaggi? # byte &#8230; <a title=\"Numeri interi\" class=\"read-more\" href=\"https:\/\/www.valcon.it\/pp\/numeri-interi-2\/\" aria-label=\"Per saperne di pi\u00f9 su Numeri interi\">Leggi tutto<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-2460","post","type-post","status-publish","format-standard","hentry","category-prog"],"_links":{"self":[{"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/posts\/2460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/comments?post=2460"}],"version-history":[{"count":30,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/posts\/2460\/revisions"}],"predecessor-version":[{"id":57629,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/posts\/2460\/revisions\/57629"}],"wp:attachment":[{"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/media?parent=2460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/categories?post=2460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.valcon.it\/pp\/wp-json\/wp\/v2\/tags?post=2460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}