Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <pre><code>//part of the question is about function signature .. the types of parameters //below we have completely described the type again //slight improvement of parameter type .. not recommended //I hope I had not said too much and too little at the same time //3 possible improvements follow void buildlist1( char (&amp;da)[5][25], std::ifstream &amp; ifs) { for (int i = 0; i &lt; 5; ++i)//not recommended explicit magic number { da[i][0] = 0;//compensate for empty file/stream ifs &gt;&gt; da[i];//dangerous cout &lt;&lt; da[i] &lt;&lt; "...";//debugging danger data can be lost with data larger than allocated } } //cleaner parameter type struct maintaininfo { //consider this struct as possible data to pass as reference or value static const int x1 = 5; static const int x2 = 25; //the array info is available char data[x1][x2]; }; void buildlist2( maintaininfo &amp; mi, std::ifstream &amp; ifs) { for (int i = 0; i &lt; maintaininfo::x1; ++i)//number defined in struct/class { mi.data[i][0] = 0;//compensate for empty file/stream ifs &gt;&gt; mi.data[i];//dangerous overflow possibly cout &lt;&lt; mi.data[i] &lt;&lt; "...";//debugging danger data can be lost with data larger than allocated } //elided similar to above } // IMHO I would prefer something in this direction // The person posing question may have contrary priorities and constraints void buildlistmodern( std::vector&lt;string&gt; &amp; svs, std::ifstream &amp; ifs) { for (int i = 0; i &lt; 5; ++i)//magic explicit number { std::string s;//compensate for empty file ifs &gt;&gt; s; //possibly process the string s here again svs.push_back(s); cout &lt;&lt; svs[i] &lt;&lt; "..."; } } int readfile() { const int listsize = 5; auto filename = "c:\\delete\\delete.txt"; { cout &lt;&lt; endl &lt;&lt; "this seems unsafe and old fashioned arrays for casual use are dangerous" &lt;&lt; endl ; std::ifstream ifs(filename); if (ifs.good()) { char cardlist[listsize][25];//dangerous magic explicit numbers buildlist1(cardlist, ifs); cout &lt;&lt; endl &lt;&lt; "final tally" &lt;&lt; endl; for (int i = 0; i &lt; 5; ++i) { cout &lt;&lt; cardlist[i] &lt;&lt; "..."; } } else cout &lt;&lt; "File Problem" &lt;&lt; endl; } { cout &lt;&lt; endl &lt;&lt; "array is encapsulated within type" &lt;&lt; endl ; std::ifstream ifs(filename); if (ifs.good()) { maintaininfo cardlist; buildlist2(cardlist, ifs); cout &lt;&lt; endl &lt;&lt; "final tally" &lt;&lt; endl; for (int i = 0; i &lt; 5; ++i) { cout &lt;&lt; cardlist.data[i] &lt;&lt; "..."; } } else cout &lt;&lt; "File Problem" &lt;&lt; endl; } { cout &lt;&lt; endl &lt;&lt; "this looks more modern ... but may be beyond the scope of the question" &lt;&lt; endl; std::ifstream ifs(filename); if (ifs.good()) { std::vector&lt;string&gt;svs; buildlistmodern(svs, ifs); cout &lt;&lt; endl &lt;&lt; "final tally "&lt;&lt; endl; if (svs.size() == 0) cout &lt;&lt; "No data in file" &lt;&lt; endl; for (const auto &amp; s : svs) { cout &lt;&lt; s &lt;&lt; "..."; } cout &lt;&lt; endl &lt;&lt; "fixed method ... not recommended ...but you might know better" &lt;&lt; endl; for (int i = 0; i &lt; 5; ++i) { cout &lt;&lt; svs[i] &lt;&lt; "..."; } } else cout &lt;&lt; "File Problem" &lt;&lt; endl; } return 0; } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POc++ array from file input
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USVIRTUAL-VOID
    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. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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