#include <iostream>
using namespace std;
struct Author {
int id ;
string fullname;
string nickname;
int age ;
};
struct Book {
int id ;
string title;
int year;
float price ;
};
void menu (){
cout << "Add New Author (1) \n" ;
cout << "Display Author List (2)\n " ;
cout << "Add New Book (3) \n" ;
cout << "Display Book List (4) \n" ;
cout << "Edit Author nickname (5) \n" ;
cout << "Quit The Program (0) \n\n" ;
cout << "Please Enter The Number : " ;
}
Author addauthor(Author *v ){
cout << "Enter ID: ";
cin >> v->id;
cout << "Enter Full Name: ";
cin.ignore();
getline(cin ,v->fullname) ;
cout << "Enter nickname: ";
cin >> v->nickname;
cout << "Enter Age: ";
cin >> v->age;
cout << endl ;
return *v ;
}
void displayauthor(Author *v ){
cout << "ID: " << v->id << endl;
cout << "Full Name: " << v->fullname << endl;
cout << "Nickname: " << v->nickname << endl ;
cout << "Age: " << v->age << endl << endl;
}
Book addbook(Book *v ){
cout << "Enter ID: ";
cin >> v->id;
cout << "Enter Title: ";
cin.ignore();
getline(cin ,v->title);
cout << "Enter Year: ";
cin >> v->year;
cout << "Enter Price : RM";
cin >> v->price;
cout << endl ;
return *v ;
}
void displaybook(Book *v ){
cout << "ID: " << v->id << endl;
cout << "Title: " << v->title << endl;
cout << "Year: " << v->year << endl ;
cout << "Price: RM" << v->price << endl << endl;
}
int main()
{
int n ;
Author a[1000];
Book b[1000];
int i, j , num1 , num2 ,id ;
string sr, rp;
do {
menu();
cin >> n ;
{
if (n==1) {
cout << "Please Enter the number of Author (Max 100): ";
cin >> num1;
cout << endl ;
for(i = 0 ;i < num1 ; i )
{
a[i]= addauthor(&a[i]);
}
}
else if (n==2) {
cout << "\nAuthor Information." << endl << endl;
for(i = 0 ;i < num1 ; i )
{
displayauthor(&a[i]);
}
}
else if (n==3) {
cout << "Please Enter the number of Book (Max 100): ";
cin >> num2;
cout << endl ;
for( i = 0 ;i < num2 ; i )
{
b[i]= addbook(&b[i]);
}
}
else if (n==4) {
cout << "\nBook Information." << endl << endl;
for(i = 0 ;i < num2 ; i )
{
displaybook(&b[i]);
}
}
else if (n==5) {
cout << "Please Enter Old Nickname : " << endl ;
cin >> sr ;
cout << "Please Enter Author New Nickname : " << endl ;
cin >> rp ;
for (int j = 0 ; j < num1 ; j ){
if (a.nickname[j] == sr){
cout << " The nickname has been Found." ;
a.nickname[j]=rp;
}
else {
cout << " Nickname not found ." ;
}
}
}
else {
cout << "The number you've enter is not available"<< endl << endl ;
}
}
}while (n !=0);
cout << "Program end" ;
return 0;
}
I tried to replace a nickname for the selected author which happen on this part
else if (n==5) {
cout << "Please Enter Old Nickname : " << endl ;
cin >> sr ;
cout << "Please Enter Author New Nickname : " << endl ;
cin >> rp ;
for (int j = 0 ; j < num1 ; j ){
if (a.nickname[j] == sr){
cout << " The nickname has been Found." ;
a.nickname[j]=rp;
}
else {
cout << " Nickname not found ." ;
}
}
}
So basically, the user tried to enter a new nickname for the Author by having the user to enter an old one and the error is "error: request for member ‘nickname’ in ‘a’, which is of non-class type ‘Author [1000]’" which happened in this 2 lines :
-
if (a.nickname[j] == sr){ -
a.nickname[j]=rp;
CodePudding user response：
The problem you're facing is just the order of operations you're performing.
a is an array of Authors, nickname is the member variable you're trying to access.
you first need to decide which array entry you want to select by using a[j], then afterwards access the member variable 'nickname' by appending .nickname.
this results in the statement a[j].nickname instead of a.nickname[j]