using sort selection with an array of structs in c++

Question

I can't figure out how to get the sort selection working. I have to sort the scores (doubles) from the struct in ascending order.

Here is my code, I will comment where i am getting the errors.

My struct:

struct diveInfo   
{
    string diversName;
    double totalScore;
    double totalScore;
    double diff;
    double scores[NUM_SCORES];
};

My function to sort the scores in ascending order:

void selectionSort(diveInfo *ptr,  int size)
{
    diveInfo temp;

    double minValue;

    int startScan;
    int minIndex;

    for ( startScan = 0; startScan < (size - 1); startScan++)
    {
        minIndex = startScan;
        minValue = ptr[startScan].scores; //keep getting an error here saying type double cannot be assigned to an entity of type double.
        temp = ptr[startScan];

        for (int index = startScan + 1; index < size; index++)
        {
            if ( ptr[index].scores < minValue) 
            {
                temp = ptr[index];
                minIndex = index;
            }

        }
        ptr[minIndex] = ptr[startScan];
        ptr[startScan] = temp;
    }
}

scores is an array. Do you perhaps want to sort on the totalScore? You do need to think about what you are doing. It should be clear that assigning an array of doubles to a double is not possible. — john
– john, Commented Apr 24, 2013 at 14:22

alexrider · Accepted Answer · 2013-04-24 14:17:05Z

1

scores is array of doubles, you need to specify index in this array to access specific double value.
For example minValue = ptr[startScan].scores[0];

answered Apr 24, 2013 at 14:17

alexrider

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Suvarna Pattayil · Accepted Answer · 2013-04-24 14:26:02Z

1

minValue = ptr[startScan].scores;

scores is an array of doubles. arrayname acts as a pointer as well. scores is of type double* [precisely one that can point to an array of size NUM_SCORES] You are assigning a double pointer to an int.

edited Apr 24, 2013 at 14:26

answered Apr 24, 2013 at 14:19

Suvarna Pattayil

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W.B. · Accepted Answer · 2013-04-24 14:22:59Z

0

You're trying to assign double* (an array of doubles is a double*) to a double.

You can try changing your array of doubles into a vector of doubles. Then you can sort them using std::sort or std::stable_sort.

edited Apr 24, 2013 at 14:22

answered Apr 24, 2013 at 14:17

W.B.

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