Databases
StackOverflow2013
Postsdbo
PORead .txt files from C++ program in Xcode
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PORead .txt files from C++ program in Xcode
    primarykey
    data
    text
    <p>I have been struggling on getting my C++ program to read my .txt file from Xcode. I even tried putting the .txt file in the same directory of my Xcode C++ program but it won't read from it successfully. I am trying to fill the dnaData array with all the nucleotides in the file, so I only have to read it once and then I can just operate on that array. Below is just a part of my code that handles the file. The idea of the whole program is to write a program that reads an input file (dna.txt) containing DNA sequences, analyzes the input in various ways, and outputs several files containing various results. The maximum number of nucleotides (see Table 1) in the input file will be 50,000. Any suggestions please?</p> <pre><code>#include &lt;fstream&gt; #include &lt;cstdlib&gt; #include &lt;iostream&gt; #include &lt;string&gt; #include &lt;sstream&gt; using namespace std; const int MAX_DNA = 50000; // Global DNA array. Once read from a file, it is // stored here for any subsequent function to use char dnaData[MAX_DNA]; int readFromDNAFile(string fileName) { int returnValue = 0; ifstream inStream; inStream.open(fileName.c_str()); if (inStream.fail()) { cout &lt;&lt; "Input file opening failed.\n"; exit(1); } if (inStream.good()) { char nucleotide; int counter = 0; while ( inStream &gt;&gt; nucleotide ) { dnaData[counter] = nucleotide; counter++; } returnValue = counter; } inStream.close(); return returnValue; cout &lt;&lt; "Read file completed" &lt;&lt; endl; } // end of readFromDNAfile function </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USdnadri
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PORead .txt files from C++ program in Xcode
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat is the output and is program end successfully or failed?
      singulars
      1. PORead .txt files from C++ program in Xcode
      1. USThats how we roll
    2. COUse `std::vector`. There's no need to use a fixed array here, only makes things more complicated..
      singulars
      1. PORead .txt files from C++ program in Xcode
      1. USlethal-guitar
    3. CO"but it won't read from it successfully" is not very specific. Please explain the error/problem/unexpected output/etc. you get.
      singulars
      1. PORead .txt files from C++ program in Xcode
      1. USlethal-guitar
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload