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POpass by reference and const function
 

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  1. POpass by reference and const function
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    <p>Basically I need to change the Two StudentType* functions to const but i know its not letting me because of the &amp;ampersand sign on the ReadStudentData function, is there anyway around this?</p> <p>I am not asking for someone to do my hw just point me in right direction</p> <p>it brings up a whole bunch of errors when I try to throw const in it</p> <p>this is what i am trying to get:</p> <pre><code>StudentType * SortStudentByName(const StudentType* student, int size); void ReadStudentData(ifstream&amp; infile, StudentType*&amp; student, int&amp; numOfStudents) { string firstName, lastName; int testScore; int count = 0; infile &gt;&gt; numOfStudents; try { student = new StudentType[numOfStudents]; while (infile &gt;&gt; firstName &gt;&gt; lastName &gt;&gt; testScore) { if (testScore &gt;= 0 &amp;&amp; testScore &lt;=100) { student[count].studentName = lastName + ", " + firstName; student[count].testScore = testScore; count++; } } numOfStudents = count; } catch (bad_alloc) { cout &lt;&lt; "Failed to allocate memory" &lt;&lt; endl; numOfStudents = 0; student = NULL; } } StudentType* SortStudentsByName(StudentType* student, int numStudents) { int startScan, minIndex; for (startScan = 0; startScan &lt; (numStudents-1); startScan++) { minIndex = startScan; for (int index = startScan; index &lt; numStudents; index++) { if (student[index].studentName &lt; student[minIndex].studentName) minIndex = index; } StudentType temp = student[minIndex]; student[minIndex] = student[startScan]; student[startScan] = temp; } cout &lt;&lt; endl; cout &lt;&lt; "List of Students sorted Alphabetically "&lt;&lt; endl; DisplayAllStudents(student, numStudents); return student; } StudentType* SortStudentsByScore(StudentType* student, int numStudents) { int startScan, minIndex; for (startScan = 0; startScan &lt; (numStudents-1); startScan++) { minIndex = startScan; for ( int index = startScan; index &lt; numStudents; index++) { if( student[index].testScore&gt;student[minIndex].testScore) minIndex = index; } StudentType temp = student[minIndex]; student[minIndex] = student[startScan]; student[startScan] = temp; } cout &lt;&lt;"List of Students sorted by Score from Highest to Lowest" &lt;&lt; endl; DisplayAllStudents(student, numStudents); return student; } </code></pre>
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    1. USAndrey Mishchenko
    1. USJose Meza
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    1. CONot surprised it complains. You assign to/thru student in both functions, and you cant assign to consts.
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      1. USRichardPlunkett
    2. COWhy do you want to "throw in" const? Your function modifies the `StudentType` objects. It doesn't make sense to require them to be constant.
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      1. USjogojapan
    3. CONote that `student[a] = x` means: _Modify_ the object at position `a` of the `student` array so it becomes a copy of `x`. It does _not_ mean: Replace the constant object at position `a` of the array with the constant object `x`. So what you are doing _is_ an attempt to modify a constant object, not an attempt to replace one constant object with another.
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      1. USjogojapan
 

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