{"id":15,"date":"2020-03-17T22:20:00","date_gmt":"2020-03-17T22:20:00","guid":{"rendered":"http:\/\/www.goncalo.pt\/wordpress\/?p=15"},"modified":"2023-10-07T03:35:32","modified_gmt":"2023-10-07T03:35:32","slug":"ipv4-subnetting-calculator","status":"publish","type":"post","link":"https:\/\/www.goncalo.pt\/por\/2020\/03\/17\/ipv4-subnetting-calculator\/","title":{"rendered":"2020-03-17 – IPV4 Subnetting Calculator"},"content":{"rendered":"

Imagem de 17 de Mar\u00e7o, numa altura em que estava a “ensinar” o programa a fazer c\u00e1lculos de subnetting. \"?\"<\/span><\/span><\/p>\n

Texto original:<\/p>\n

\u00abO trabalho de hoje. As classes e fun\u00e7\u00f5es referentes ao c\u00e1lculo de IPv4 e Subnetting, para redes, est\u00e1 praticamente acabado.<\/p>\n

O problema \u00e9 que tentei programar de maneira simples mas isso nem sempre \u00e9 considerado simples dado que \u00e9 C++. Em cima podemos ver bitwise operators que uso como atalho para saber que parte de um octeto de um IP \u00e9 rede e que parte pertence aos hosts, a maneira mais r\u00e1pida que me lembrei \u00e9 esta, n\u00e3o sei \u00e9 at\u00e9 que ponto \u00e9 f\u00e1cil de compreender depois.<\/p>\n

Mas n\u00e3o posso sacrificar performance e eleg\u00e2ncia em nome de ter c\u00f3digo que todos possam compreender, espero n\u00e3o estar a exagerar nos coment\u00e1rios. Mas isto \u00e9 para ser Open Source depois. Tamb\u00e9m deduzo que s\u00f3 programadores experientes em C++ \u00e9 que v\u00e3o mexer nisto um dia.<\/p>\n

J\u00e1 tem umas 400 linhas de c\u00f3digo esta classe relacionada com subnetting. Por norma s\u00f3 uso classes quando as fun\u00e7\u00f5es s\u00e3o relacionadas com um objecto, e quando n\u00e3o s\u00e3o, usamos namespaces para agregar fun\u00e7\u00f5es. H\u00e1 uns coitados que acham que tudo deve ser uma classe, mas isso \u00e9 errado, s\u00e3o h\u00e1bitos que herdam dos Javas e afins.<\/p>\n

Neste caso \u00e9 uma classe porque vai ser instanciada, mas ter\u00e1 muitas member functions est\u00e1ticas.<\/p>\n

Ela j\u00e1 calcula quantas subnets tem, quantos ips, quantos ips por subnet, quais os ips de rede e broadcast de cada rede, quais os saltos, como fica em bin\u00e1rio, etc.<\/p>\n

Est\u00e1 pronto para come\u00e7ar a criar templates de perguntas CCNA e CCNP para as pessoas poderem praticar subnetting, com perguntas pr\u00f3ximas das reais, mas vari\u00e1veis, para as pessoas aprenderem de verdade ao inv\u00e9s de andarem a memorizar como alguns fazem.<\/p>\n

Dentro de alguns meses este software gr\u00e1tis estar\u00e1 dispon\u00edvel para formadores, e Open Source.<\/p>\n

Talvez um dia fa\u00e7a a vers\u00e3o gr\u00e1fica tamb\u00e9m.<\/p>\n

PS: Sou contra o uso de “using namespace std”, por motivos que n\u00e3o vale a pena explicar aqui. \"?\"<\/span><\/p>\n

2020-03-17.\u00bb<\/p>\n","protected":false},"excerpt":{"rendered":"

Imagem de 17 de Mar\u00e7o, numa altura em que estava a “ensinar” o programa a fazer c\u00e1lculos de subnetting. 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