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I need help with adding a structure that allows user to enter name-score pairs. I also need help in modifing my sorting and average calculating functions so they take array of structures with each structure containing the name and score of a single student. In traversing the arrays, use pointers rather than array indices. I really have trouble understanding structures so can someone please help me get started in doing this. Here is

my program

```
void sort(int* a, const int size)
{
for (int i = 0; i < size; ++i)
for (int j = i + 1; j < size; ++j)
if (a[i] > a[j])
{
int tmp = a[i];
a[i] = a[j];
a[j] = tmp;
}
}
double average(int* a, const int size)
{
double avg = 0;
for (int i = 0; i < size; ++i)
avg += a[i];
avg /= size;
return avg;
}
void display(int* a, const int size)
{
cout << "Sorted scores list: ";
for (int i = 0; i < size; ++i)
cout << a[i] << " ";
cout << endl;
cout << "Average score: " << average(a, size) << endl;
}
int main()
{
const int MAX_SIZE = 100;
int* a = new int[MAX_SIZE];
int n;
cout << "Scores amount: ";
cin >> n;
cout << "Enter scores:" << endl;
for (int i = 0; i < n; ++i)
{
cout << i + 1 << ": ";
while (true)
{
cin >> a[i];
if (a[i] < 0)
cout << "Must be nonnegative\n";
else
break;
}
}
sort(a, n);
display(a, n);
delete[] a;
return 0;
}
```