在c ++中使用排序选择和结构数组

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;
    }
}

Answer 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];

Answer 2

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.

Answer 3

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 .