void PrintOneData(Student* stu)
{
cout << "Name: " << stu-> stdName << "Academic number: " << stu-> hakbun << endl;
cout.width(10); cout << "========================================================" << endl;
cout.width (20); cout << "subject name";
cout.width (10); cout << "subject credit";
cout.width (10); cout << "subject grade";
cout.width (10); cout << "subject rating" << endl;
cout.width(10); cout << "========================================================" << endl;
for (int j = 0; j < 3; j++)
{
cout.width(20); cout << stu->sub[j].subName;
cout.width(7); cout << stu->sub[j].hakjum;
cout.width(10); cout << stu->sub[j].grade;
cout.width(11); cout << stu->sub[j].gpa << endl;
}
cout << "========================================================" << endl;
stu->ave_gpa = (stu->sub[0].gpa + stu->sub[1].gpa + stu->sub[2].gpa) / 3;
cout.width (46); cout << "Average rating: " << stu->ave_gpa << endl;
cout << endl << endl;
}
They want to modify the code above, which source should I add more?
void PrintOneData(const Student& stu)
{
cout << "Name: " << stu-> stdName << "Academic number: " << stu-> hakbun << endl;
cout.width(10); cout << "========================================================" << endl;
cout.width (20); cout << "subject name";
cout.width (10); cout << "subject credit";
cout.width (10); cout << "subject grade";
cout.width (10); cout << "subject rating" << endl;
cout.width(10); cout << "========================================================" << endl;
for (int j = 0; j < 3; j++)
{
cout.width(20); cout << stu->sub[j].subName;
cout.width(7); cout << stu->sub[j].hakjum;
cout.width(10); cout << stu->sub[j].grade;
cout.width(11); cout << stu->sub[j].gpa << endl;
}
cout << "========================================================" << endl;
stu->ave_gpa = (stu->sub[0].gpa + stu->sub[1].gpa + stu->sub[2].gpa) / 3;
cout.width (46); cout << "Average rating: " << stu->ave_gpa << endl;
cout << endl << endl;
}
In C++, the member access operators are . and ->.
Of these, -> is used in pointers, and . is used in addition.
For example:
std::string* pValue = new std::string();
pValue->size();
std::string value;
value.size();
std::string& refvalue = *pValue;
refvalue.size();
pValue is a pointer. The member of the object that the pointer points to uses -> as mentioned earlier.
value is a general variable. Use . because it is not a pointer.
refvalue is a reference. Use . because it is not a pointer.
Looking at the code in the question, stu has changed from pointer to reference.
Accordingly, stu->sub is stu.Changes are required, such as sub.
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