Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here's an answer using std::sort. I changed some of your C-like approach and using std::sort actually forces me to do it. The comparison function(compareStudents) needs objects so I had to create the struct. Vector has been used for the same reason although it would have been possible to keep using arrays but that's generally frowned upon.</p> <pre><code>#include &lt;iostream&gt; #include &lt;algorithm&gt; #include &lt;vector&gt; using namespace std; struct Student { string name; float gpa; Student(string name, float gpa) { this-&gt;name = name; this-&gt;gpa = gpa; } }; bool compareStudents(Student a, Student b) { return a.name.compare(b.name) &lt; 0; } int main() { const int studentCount = 2; vector&lt;Student&gt; studentVector; int i; for (i = 0 ; i &lt; studentCount ; i++) { cout &lt;&lt; "Enter name " &lt;&lt; i + 1 &lt;&lt; " : "; string name; cin &gt;&gt; name; cout &lt;&lt; "Enter GPA : "; float gpa; cin &gt;&gt; gpa; cout &lt;&lt; endl; studentVector.push_back(Student(name, gpa)); } cout &lt;&lt; "\n********** Your entered data **********\n\n"; cout &lt;&lt; "\tName" &lt;&lt; "\t\t" &lt;&lt; "GPA\n\n"; vector&lt;Student&gt;::iterator it = studentVector.begin(); for (; it != studentVector.end(); ++it) { Student student = *it; cout &lt;&lt; "\t" &lt;&lt; student.name &lt;&lt; "\t\t" &lt;&lt; student.gpa; cout &lt;&lt; endl; } sort(studentVector.begin(), studentVector.end(), compareStudents); cout &lt;&lt; "\n\n******* Sorted data (w.r.t name) *******\n\n"; cout &lt;&lt; "\tName" &lt;&lt; "\t\t" &lt;&lt; "GPA\n\n"; it = studentVector.begin(); for (; it != studentVector.end(); ++it) { Student student = *it; cout &lt;&lt; "\t" &lt;&lt; student.name &lt;&lt; "\t\t" &lt;&lt; student.gpa; cout &lt;&lt; endl; } cout &lt;&lt; endl; return 0; } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POSort names alphabetically
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USdenarced
    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. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSorry but please can you edit and replace the `vector` and `sorting` portion with logical algorithms using loops etc? I haven't studied these yet and its difficult for me to understand.
      singulars
      1. PO
      1. USSilver Falcon
    2. CO@denarced . Nice work. you wrote ........Student student = *it; ......did you mean ....const Student & student = *it; ...?
      singulars
      1. PO
      1. USVIRTUAL-VOID
    3. CONo, but that's probably correct :) I wrote the code with minimal attention to details because only the basic idea was important. I haven't been dealing with C++ lately.
      singulars
      1. PO
      1. USdenarced
 

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