How to save data in .txt file in VisualG?

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How to save data in .txt file in VisualG?

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#1 by (3 votes)

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Staff need to make a registration system in Portugol for a college job. However, I want the data to be saved for a possible query.

Is it possible to save data in a .txt file in VisualG?

(I searched for the "file" command but I did not understand how to use it)

Thank you!

visualg portugol

asked by anonymous 22.10.2017 / 06:09

1 answer

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score 3 · Answer 1

There is a possibility of saving data to a file in .txt in VisualG! VisuAlg allows the storage of data in a text file, obtaining the data when executing the leia commands.

This feature works as follows:

(Second this font )

If the specified named file does not exist, VisuAlg will reading data by typing, storing the data read in this in the order they are provided.

If the file exists, VisuAlg will get the data from this file until it arrives to its end. From there, you will do the data readings by typing.

Only one file command can be used in each pseudocode, and it should be in the declarations section (depending on the "success" of this feature, in future versions it can be improved ...).

If a path is not provided, VisuAlg will look for this file in the current working folder (usually it is the folder where the program VISUALG.EXE is). This command does not provide for a default extension; therefore, the The filename specification must be complete, including with your extension (for example, .txt, .dat, etc.).

The syntax of the command is:

arquivo < nome-de-arquivo >

<nome-de-arquivo> is a constant character (in double quotation marks). See the following example:

  algoritmo "lendo do arquivo"
  arquivo "teste.txt"
  var x,y: inteiro
  inicio
  para x de 1 ate 5 faca
  leia (y)
  fimpara
  fimalgoritmo

EXTRA

Your variables can also be stored in an array of type type and test it in the query and implement the code with a menu. (With registration and query)

   algoritmo "lendo do arquivo"
   arquivo "teste.txt"
   var x,y,i,j: inteiro
   char opcao
    vetor mat[5][5]
   inicio
   repita
   escreval("MENU")
   escreval("A- GRAVAR ARQUIVOS")
   escreval("B- PROCURAR ARQUIVOS")
   escreval("s-Sair")
   escolha(opcao)
   caso 'A'
   escreval("Leia matriz:")
   para i de 1 ate 5 faca
   para j de 1 ate 5 faca
   leia(m[i][j])
   fimpara
   fimpara


   caso 'B'
   // compare com a variável que quiser 
   leia(x)
   para i de 1 ate 5 faca
   para j de 1 ate 5 faca
   se(x=m[i][j]) entao
   ...
   fimse
   fimpara
   fimpara
   ate(opcao='s')
   fimescolha
   fimalgoritmo

You can use the file command, however, it may not be the best option.

For each command leia() that VisuAlg finds, it will be reading this file and playing in the variable that is in leia() . Translating ... While not reaching the end of the file, all leia() is directed to the file ... it will not be possible to read any user data via keyboard while the file does not finish.

If it is to be deployed with a file, always remember the cleanup command might be useful.