{"id":3968,"date":"2018-04-12T06:00:26","date_gmt":"2018-04-12T04:00:26","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=3968"},"modified":"2018-04-19T12:02:20","modified_gmt":"2018-04-19T10:02:20","slug":"numeros-superpares","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/numeros-superpares\/","title":{"rendered":"N\u00fameros superpares"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   superpar :: Int -> Bool\n<\/pre>\n<p>tal que (superpar n) se verifica si n es un n\u00famero par tal que todos sus d\u00edgitos son pares. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   superpar 426  ==  True\n   superpar 456  ==  False\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\n-- 1\u00aa definici\u00f3n (por recursi\u00f3n)\nsuperpar :: Int -> Bool\nsuperpar n | n < 10    = even n\n           | otherwise = even n &#038;&#038; superpar (n `div` 10)\n\n-- 2\u00aa definici\u00f3n (por comprensi\u00f3n):\nsuperpar2 :: Int -> Bool\nsuperpar2 n = and [even d | d <- digitos n]\n\ndigitos :: Int -> [Int]\ndigitos n = [read [d] | d <- show n]\n\n-- 3\u00aa definici\u00f3n (por recursi\u00f3n sobre los d\u00edgitos):\nsuperpar3 :: Int -> Bool\nsuperpar3 n = sonPares (digitos n)\n    where sonPares []     = True\n          sonPares (d:ds) = even d && sonPares ds\n\n-- la funci\u00f3n sonPares se puede definir por plegado:\nsuperpar3' :: Int -> Bool\nsuperpar3' n = sonPares (digitos n)\n    where sonPares ds = foldr ((&&) . even) True ds\n\n-- 4\u00aa definici\u00f3n (con all):\nsuperpar4 :: Int -> Bool\nsuperpar4 n = all even (digitos n)\n\n-- 5\u00aa definici\u00f3n (con filter):\nsuperpar5 :: Int -> Bool\nsuperpar5 n = filter even (digitos n) == digitos n\n\n-- 6\u00aa definici\u00f3n (con filter):\nsuperpar6 :: Int -> Bool\nsuperpar6 n = all (`elem` \"02468\") (show n)\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n superpar :: Int -> Bool tal que (superpar n) se verifica si n es un n\u00famero par tal que todos sus d\u00edgitos son pares. Por ejemplo, superpar 426 == True superpar 456 == False Soluciones &#8212; 1\u00aa definici\u00f3n (por recursi\u00f3n) superpar :: Int -> Bool superpar n | n < 10 =...\n<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[5],"tags":[41,8,30,91,38,94,11,95,6,33],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3968"}],"collection":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/comments?post=3968"}],"version-history":[{"count":2,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3968\/revisions"}],"predecessor-version":[{"id":3991,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3968\/revisions\/3991"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=3968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=3968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=3968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}