Question

void sortAlphabetically(int listLength, contactInfo* arrayOfStructs)
{
    contactType temp;

    for (int i = 0; i < listLength; i++)
    {
        if (strcmp(arrayOfStructs[i].contactName, arrayOfStructs[i+1].contactName) > 0)
        {
                     temp = arrayOfStructs[i];    //swapping entire struct
                     arrayOfStructs[i] = arrayOfStructs[i+1];
                     arrayOfStructs[i+1] = temp;
        }
    }
}

Answer 1

The following expression is invalid when i == (listLength-1) (assuming that listLength is a count of the number of elements in arrayOfStructs):

arrayOfStructs[i+1]