{"id":6564,"date":"2022-01-27T06:00:33","date_gmt":"2022-01-27T04:00:33","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=6564"},"modified":"2022-02-23T11:47:21","modified_gmt":"2022-02-23T09:47:21","slug":"suma-de-cadenas","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/suma-de-cadenas\/","title":{"rendered":"Suma de cadenas"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   sumaCadenas :: String -> String -> String\n<\/pre>\n<p>tal que (sumaCadenas xs ys) es la cadena formada por el n\u00famero entero que es la suma de los n\u00fameros enteros cuyas cadenas que lo representan son xs e ys; adem\u00e1s, se supone que la cadena vac\u00eda representa al cero. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   sumaCadenas \"2\"   \"6\"  == \"8\"\n   sumaCadenas \"14\"  \"2\"  == \"16\"\n   sumaCadenas \"14\"  \"-5\" == \"9\"\n   sumaCadenas \"-14\" \"-5\" == \"-19\"\n   sumaCadenas \"5\"   \"-5\" == \"0\"\n   sumaCadenas \"\"    \"5\"  == \"5\"\n   sumaCadenas \"6\"   \"\"   == \"6\"\n   sumaCadenas \"\"    \"\"   == \"0\"\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\n-- 1\u00aa soluci\u00f3n\n-- ===========\n\nsumaCadenas1 :: String -> String -> String\nsumaCadenas1 xs ys =\n  show (sum (map read (filter (not . null) [xs, ys])))\n\n-- 2\u00aa soluci\u00f3n\n-- ===========\n\nsumaCadenas2 :: String -> String -> String\nsumaCadenas2 =\n  ((show . sum . map read . filter (not . null)) .) . (. return) . (:)\n\n-- 3\u00aa soluci\u00f3n\n-- ===========\n\nsumaCadenas3 :: String -> String -> String\nsumaCadenas3 \"\" \"\" = \"0\"\nsumaCadenas3 \"\" ys = ys\nsumaCadenas3 xs \"\" = xs\nsumaCadenas3 xs ys = show (read xs + read ys)\n\n-- 4\u00aa soluci\u00f3n\n-- ===========\n\nsumaCadenas4 :: String -> String -> String\nsumaCadenas4 xs ys = show (numero xs + numero ys)\n\n-- (numero xs) es el n\u00famero entero representado por la cadena xs\n-- suponiendo que la cadena vac\u00eda representa al cero.. Por ejemplo,\n--    numero \"12\"   ==  12\n--    numero \"-12\"  ==  -12\n--    numero \"0\"    ==  0\n--    numero \"\"     ==  0\nnumero :: String -> Int\nnumero \"\" = 0\nnumero xs = read xs\n<\/pre>\n<p>El c\u00f3digo se encuentra en <a href=\"https:\/\/github.com\/jaalonso\/Exercitium\/blob\/main\/src\/Suma_de_cadenas.hs\">GitHub<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n sumaCadenas :: String -> String -> String tal que (sumaCadenas xs ys) es la cadena formada por el n\u00famero entero que es la suma de los n\u00fameros enteros cuyas cadenas que lo representan son xs e ys; adem\u00e1s, se supone que la cadena vac\u00eda representa al cero. Por ejemplo, sumaCadenas \u00ab2\u00bb \u00ab6\u00bb&#8230;<\/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":[2],"tags":[35,11],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6564"}],"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=6564"}],"version-history":[{"count":4,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6564\/revisions"}],"predecessor-version":[{"id":6681,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/6564\/revisions\/6681"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=6564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=6564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=6564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}