Number in full for number

Question

I would like to transform an extended number to normal int; example:

FunçãoParaConverter("trinta e dois")                        // retorna 32
FunçãoParaConverter("mil vinte e quatro")                   // retorna 1024
FunçãoParaConverter("mil trezentos e trinta e tres")        // retorna 1333
FunçãoParaConverter("sete mil setecentos e setenta e sete") // retorna 7777

Answer 1

Based on the examples listed in the question comments, I created the routine below to convert the number to full int.

In short, the routine works as follows: it breaks the text in words and searches the dictionaries (NumDict and MilharDict) the value that will be accounted for each word.

It is working well but can be improved. For example: a syntax check of the text could be implemented to generate an error when the text was misspelled (eg thirty-ten)

An example of code running online at https://ideone.com/vWGJYQ (by @Virgilionovic)

Dictionary<string,int> NumDict;
Dictionary<string,int> MilharDict;

private int ExtensoToInteiro(string extenso)
{           

    if (NumDict == null)
    {
        NumDict = new Dictionary<string,int>();
        MilharDict = new Dictionary<string,int>();

        NumDict.Add("zero",0);
        NumDict.Add("um",1);
        NumDict.Add("dois",2);
        NumDict.Add("três",3);
        NumDict.Add("quatro",4);
        NumDict.Add("cinco",5);
        NumDict.Add("seis",6);
        NumDict.Add("sete",7);
        NumDict.Add("oito",8);
        NumDict.Add("nove",9);

        NumDict.Add("dez",10);
        NumDict.Add("onze",11);
        NumDict.Add("doze",12);
        NumDict.Add("treze",13);
        NumDict.Add("quatorze",14);
        NumDict.Add("quinze",15);
        NumDict.Add("dezesseis",16);
        NumDict.Add("dezessete",17);
        NumDict.Add("dezoito",18);
        NumDict.Add("dezenove",19);

        NumDict.Add("vinte",20);
        NumDict.Add("trinta",30);
        NumDict.Add("quarenta",40);
        NumDict.Add("cinquenta",50);
        NumDict.Add("sessenta",60);
        NumDict.Add("setenta",70);
        NumDict.Add("oitenta",80);
        NumDict.Add("noventa",90);

        NumDict.Add("cem",100);
        NumDict.Add("cento",100); 
        NumDict.Add("duzentos",200);
        NumDict.Add("trezentos",300);
        NumDict.Add("quatrocentos",400);
        NumDict.Add("quinhentos",500);
        NumDict.Add("seiscentos",600);
        NumDict.Add("setecentos",700);
        NumDict.Add("oitocentos",800);
        NumDict.Add("novecentos",900);

        MilharDict.Add("mil",1000);
        MilharDict.Add("milhão",1000000);
        MilharDict.Add("milhões",1000000);
        MilharDict.Add("bilhão",1000000000);
        MilharDict.Add("bilhões",1000000000);
    }

    int resultado = 0;
    int grupoCorrente = 0;

    foreach (var word in extenso.Split(' '))
    {
        if (NumDict.ContainsKey(word))
        {
            grupoCorrente += NumDict[word];
        }
        else if (MilharDict.ContainsKey(word))
        {
            resultado += (grupoCorrente == 0 ? 1 : grupoCorrente) * MilharDict[word];
            grupoCorrente = 0;
        }               
    }

    resultado += grupoCorrente;

    return resultado;
}