i have an array of pointers to structs. but i am trying to get under the doinsert function, which prompt for a new person to go into the list, but i cannot change the file itself, all must be done in memory.
but i cant assign the new person last name, first name and age, to the next available spot on the list.
i cant figure out how to assign, or point over.
basically, this function puts a new person into the struct, LASTNAME, FIRSTNAME, AGE.
but i use cin, but i cant pass the char to the struct.
i dont know how to do this, it says it cant covernt char[30] to *char
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void doinsert(Listtype &List)
{ //option 3
system("CLS");
char lname[30], fname[30];
int agein, recin, posin=0;
cout << "Enter a record in this format: LASTNAME <SPACE> FIRSTNAME <SPACE> AGE" << endl;
cin >> lname >> fname >> agein ;
cout << "Insert this record at what posotion: ";
//cin >> recin;
//this is where i cant make it work, i want to add new person, but i cant change the actual file, its all in memory, coping the address is the only way i see fit.
//List.person[List.size]->lastname=&lname;
//List.person[List.size]->firstname=&fname;
//List.person[List.size]->age=&agein;
//i=posin;
List.size++;
cin.ignore();
cin.ignore();
}
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the full program is here
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#include <iostream>
#include <fstream>
#include <conio.h>
#include <assert.h>
#include <string.h>
using namespace std;
struct Listnode
{
char lastname[30];
char firstname[30];
int age;
};
struct Listtype
{
Listnode* person[30];
int size;
};
Listtype initialize(void);
void filllist(Listtype &List);
void printlist(Listtype &List);
void doinsert(Listtype &List);
void dodelete(Listtype &List);
void deallocate(Listtype &List);
//void repeat();
int menu();
int main ()
{
Listtype List;
int choice;
List=initialize();
do
{
system("CLS");
choice = menu ();
switch (choice)
{
case 1: filllist(List); break;
case 2: printlist(List); break;
case 3: doinsert(List); break;
case 4: dodelete(List); break;
case 5: deallocate(List); break;
case 6: break;
default : cout << "\nINVALID...1-6 ONLY!\n";
cin.ignore();
cin.ignore();
}
} while (choice != 6);
}
int menu()
{
int choice =0;
cout<< "MENU FOR LAB1" <<endl;
cout<< "1. Fill the list from file LAB1DATA.TXT" <<endl;
cout<< "2. Print the list (include the size of the list)" <<endl;
cout<< "3. Insert a record into the list" <<endl;
cout<< "4. Delete a record from the list"<< endl;
cout<< "5. Delete all records from list" <<endl;
cout<< "6. Quit" <<endl;
cout<< endl;
cout << "ENTER YOUR CHOICE:";
cin >> choice;
cout << endl;
return choice;
}
Listtype initialize()
{
Listtype L;
for (int i=0; i<30; i++)
L.person[i]=NULL;
L.size=0;
return L;
}
void filllist(Listtype &List)
{
char lastname[30];
char firstname[30];
int age, i=0;
ifstream infile ("lab1data.txt", ios::in);
assert (!infile.fail());
while (infile>>lastname)
{
infile>> firstname;
infile>> age;
List.person[i]=new Listnode;
strcpy_s(List.person[i]->lastname, lastname);
strcpy_s(List.person[i]->firstname, firstname);
List.person[i]->age=age;
i++;
}
List.size=i;
}
void printlist(Listtype &List)
{
system("CLS");
int i;
for (i=0; i<List.size; i++)
cout << i+1 << " " << List.person[i]->lastname<<" " <<List.person[i]->firstname<<" " <<List.person[i]->age<<endl;
cout<< "\nList Size= " << List.size<< " [Hit return to continue]" <<endl;
cin.ignore();
cin.ignore();
return;
//repeat();
}
void doinsert(Listtype &List)
{ //option 3
system("CLS");
char lname[30], fname[30];
int agein, recin, posin=0;
cout << "Enter a record in this format: LASTNAME <SPACE> FIRSTNAME <SPACE> AGE" << endl;
cin >> lname >> fname >> agein ;
cout << "Insert this record at what posotion: ";
//cin >> recin;
//this is where i cant make it work, i want to add new person, but i cant change the actual file, its all in memory, coping the address is the only way i see fit.
//List.person[List.size]->lastname=&lname;
//List.person[List.size]->firstname=&fname;
//List.person[List.size]->age=&agein;
//i=posin;
List.size++;
cin.ignore();
cin.ignore();
}
void dodelete(Listtype &List)
{
printf("You've choosed option 4\n\r");
//repeat();
}
void deallocate(Listtype &List)
{
printf("You've choosed option 5\n\r");
//repeat();
}
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