C++ getting highest test score and using pointers - c++

Question

created a program to prompt the user to enter test scores and find the average, highest, and sort the test score. I am having problems I cant seem to get the higest test scores from the function I made and when I created the sorting test score function the program crashes. Can someone look at my functions and see where my problem is, I seem to get the average test score to show.
double getAverage(double*, int);
double gethighest(double*, int);
double getlowest(double*, int);
void arrayAscending(double*, int);
int main()
{
// Variable declarations
double *testScores; // Dynamically allocate an array of test scores
double average, highest, lowest;
int numTests; // Number of test scores
int count; // Counter variable
// Get the number of tests
cout << "How many tests do you wish to process? ";
cin >> numTests;
// Verify input is not a negative number
while (numTests <= 0)
{
// Get input again.
cout << "Please enter a positive number: ";
cin >> numTests;
}
// Dynamically allocate an array large enough to hold the test scores
testScores = new double[numTests];
// Get the specified number of test scores
cout << "Enter the test scores below.\n";
for (count = 0; count < numTests; count++)
{
cout << "Test " << (count + 1) << ": ";
cin >> *(testScores + count);
// Verify input is not a negative number
while (*(testScores + count) < 0)
{
// Get input again.
cout << "Please enter a valid test score.\n";
cin >> *(testScores + count);
}
}
// Calculate the average test score
average = getAverage(testScores, numTests);
highest = gethighest(testScores, numTests);
lowest = getlowest(testScores, numTests);
// Display the results.
arrayAscending(testScores, numTests);
cout << endl;
cout << "The average of those scores is: " << average << endl;
cout << "The higest of those scores is: " << highest << endl;
cout << "The lowest of those scores is: " << lowest << endl;
// Free dynamically allocated memory
delete[] testScores;
testScores = 0; // Make testScores point to null
return 0;
}
//function getAverage - calculates the average of the test scores
double getAverage(double* scores, int num)
{
double avg;
double total = 0.0;
for (int count = 0; count < num; count++)
{
total += scores[count];
}
avg = total / num;
return avg;
}
double gethighest(double* scores, int num)
{
double highnum = 0.0;
for (int i = 0; i < num; i++)
{
if (scores[i] > highnum)
highnum = scores[i];
}
return highnum;
}
double getlowest(double* scores, int num)
{
double lowestnum = 100;
for (int i = 0; i < num; i++)
{
if (scores[i] < lowestnum)
lowestnum = scores[i];
}
return lowestnum;
}
void arrayAscending(double *array, int size)
{
int startScan, minIndex;
double minElem;
for (startScan = 0; startScan < (size - 1); startScan++)
{
minIndex = startScan;
minElem = array[startScan];
for (int index = startScan + 1; index < size; index++)
{
if ((array[index]) < minElem)
{
minElem = array[index];
minIndex = index;
}
}
array[minIndex] = array[startScan];
array[startScan] = minElem;
}
}

Answer 1

void arrayAscending(double *[], int);
should be
void arrayAscending(double *, int);
You are sorting an array of doubles, not an array of pointers to double.
Also,
double *minElem;
is used later without any memory being allocated for it. Again, you probably need just
double minElem;
and not a pointer.
If you don't need to use pointers, then use std::vector and algorithms from the standard library like std::sort.