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Array List

erico (12)
I was making a array list in an assignment, so at the 'typedef int ITEMTYPE' part, I am supposed to change the 'int' with 'string, but it produces the following errors:
Compiling...
listArray.cpp
c:\users\eric\desktop\assignment 1\listarray.h(5) : error C2146: syntax error : missing ';' before identifier 'ITEMTYPE'
c:\users\eric\desktop\assignment 1\listarray.h(5) : fatal error C1004: unexpected end of file found
TestlistArray.cpp
c:\users\eric\desktop\assignment 1\listarray.h(5) : error C2146: syntax error : missing ';' before identifier 'ITEMTYPE'
c:\users\eric\desktop\assignment 1\listarray.h(5) : fatal error C1004: unexpected end of file found

so, I dont know what is the problem when I replace the 'int' with 'string' 

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#ifndef LISTARRAYH
#define LISTARRAYH
#include <string>
const int MAXLEN = 100;
typedef int ITEMTYPE; /*the typedef thing
class List{
	public:
		List();
		~List();

		ITEMTYPE retrieve (int pos) const;
		void insert (const ITEMTYPE input, int pos);
		void append (ITEMTYPE input);
		bool remove (int pos);
		int length () const;
		bool isEmpty ();
		void makeEmpty();
		void printlist();
		bool search(ITEMTYPE input);
		int itempos(ITEMTYPE input);
	private:
		ITEMTYPE item[MAXLEN];
		int len;
};
#endif */


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#include <iostream>
#include "listArray.h"
#include <string>
using namespace std;
List::List(){
	cout <<"List constructor called - Creating empty list" << endl;
	len=0;
}
List::~List(){
	cout<<"List destructor called"<<endl;
}

ITEMTYPE List::retrieve (int pos) const{
	int index=pos-1;
	int max=length();

	ITEMTYPE temp;

	if ((index>=0)&&(pos<=max)){
		temp = item[index];
	}
	return temp;
}	

void List::insert (const ITEMTYPE input, int pos){
	int len=length();
	int index=pos-1;
	int indexOfLast=len-1;

	if ((index>=0)&&(index<len)){

		for(indexOfLast;indexOfLast>=index;indexOfLast--){
			//cout<<"fg\n";
			item[indexOfLast+1]=item[indexOfLast];
		}
		item[index]=input;
	}
	else
		cout<<"\nPosition does not exist\n";
	
}
void List::append (ITEMTYPE input){
	int last=length();
	int appendpos=last;

	item[appendpos]=input;
}

bool List::remove (int pos){
	
	bool removed=false;
	int len=length();
	int index = pos-1;
	int indexOfLast=len-1;
	
	int counter=index;


	if ((index>= 0)&&(index < indexOfLast)){
		cout<<"last: "<<indexOfLast<<endl;

		do{
			//item[index]=item[index+1];
			item[counter]=item[counter+1];
			cout<<item[index];
			//cout<<counter;
			counter++;

		}while(counter<=indexOfLast);

		item[indexOfLast]=0;
		removed=true;
		
	}
	
return removed;
}

int List::length () const{
	int sum=0;
	for(int j=0; j<=MAXLEN; j++){
		if(item[j]!=0)
			sum++;
	}
	return sum;
}

bool List::isEmpty (){
	bool empty=false;
	int len=length();

	for(int j=0; j<=MAXLEN; j++){
		if(len==0)
			empty = true;
	}
	return empty;
}

void List::makeEmpty(){
	for(int j=0; j<=MAXLEN; j++){
		item[j]=0;
	}
}

void List::printlist(){
	bool empty = false;
	cout<<"The Available Items in the List are: \n";

	for (int j=0; j<=MAXLEN;j++){
		if (item[j]!=0){
			cout<<"Position: "<<j+1<<". "<<item[j]<<endl;
		}
	}

	if (empty==true){
		system("cls");
		cout<<"\n\n\t\tThe List is empty\n\n\n";
	}

}

bool List::search(ITEMTYPE input){
	bool found=false;
	int max=length();

	for(int j=0; j<=max; j++){
		ITEMTYPE element=retrieve(j);
		if(element== input)
			found = true;
	}
	return found;
}

int List::itempos(ITEMTYPE input){
	
	int max=length();
	int pos;

	for(int j=0; j<=max; j++){
		ITEMTYPE element=retrieve(j);
		if(element== input){
			pos=j;
		}
	}
	return pos;
}

int main()
{
	List ListArray;
	int Input;
	int pos;
	ITEMTYPE output;
	bool removed=false,found=false,loop;
	char choice;

	ListArray.makeEmpty();//clean the Array for usage


	int menu;
	do{
		loop=false;

		do
		{
			//system("cls"); // or system("cls") in windows
			cout << "\t Lab1 : Array Implementation of LIST ADT" << endl;
			cout << "\t\t\t Menu Choices" << endl << endl;
			cout << "\t\t1 - Insert Item " << endl;
			cout << "\t\t2 - Append Item" << endl;
			cout << "\t\t3 - Retrive Item" << endl;
			cout << "\t\t4 - Delete an Item" << endl;
			cout << "\t\t5 - Search" << endl;
			cout << "\t\t6 - Print List Items" << endl;
			cout << "\t\t7 - Clear List" << endl;
			cout << "\t\t8 - Quit" << endl << endl;

			cout << "\t\t8 - length" << endl << endl;
			cout << "\tEnter your choice: ";
			cin >>menu;

		} while ((menu <=1) && (menu >= 10));
		switch(menu)
		{
		case 1:
			system("cls");
			cout<<"Enter the value to be inserted"<<endl;
			cin>>Input;
			cout<<"Enter the position to be inserted"<<endl;
			cin>>pos;
			
			ListArray.insert(Input,pos);
			
			loop=true;
			break;

		case 2:
			system("cls");
			cout<<"Enter the value to be Appended"<<endl;
			cin>>Input;
			ListArray.append(Input);
			loop=true;
			break;
		case 3:
			system("cls");
			cout<<"Enter the position of the value to be Retrieved"<<endl;
			cin>>pos;
			output = ListArray.retrieve(pos);
			cout<<"\nThe value at position: "<<pos<<" is "<< output;
			loop=true;
			break;
		case 4:
			system("cls");
			cout<<"Enter the position of the item to be deleted"<<endl;
			cin>>pos;
			removed =ListArray.remove(pos);
			if (removed=true)
				cout<<"\nThe Item has been Successfully Deleted\n";
			else
				cerr<<"\nError deleting the Item\n";
			loop=true;
			break;

		case 5:
			system("cls");
			cout<<"Enter the value to be searched"<<endl;
			cin>>Input;
			found=ListArray.search(Input);
			pos=ListArray.itempos(Input);
			cout<<"\nThe Item: "<<Input<<" That you Queried, exists, at Position: "<<pos <<endl<<endl;
			loop=true;
			break;
		case 6:
			system("cls");
			ListArray.printlist();
			loop=true;
			break;
		case 7:
			system("cls");
			cout<<"\nAre you Sure you want to empty the List?(y/n)\n";
			cin>>choice;
			if (choice=='y')
				ListArray.makeEmpty();
			loop=true;
			break;
		case 8:
			loop=false;
			break;
		case 9:
			loop=true;
			cout<<ListArray.length ();
			break;
		default:
			cerr<<"Invalid Entry";
			loop=true;
			break;
		}
	}while (loop==true);
	
	

return 0;
}
danielkui (11)
try typedef std::string ITEMTYPE ?

Alternatively, you can make your class to be template:

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#ifndef LISTARRAYH
#define LISTARRAYH
#include <string>
const int MAXLEN = 100;

template<class T>
class List{
	public:
		List();
		~List();

		T retrieve (int pos) const;
		void insert (const T input, int pos);
		void append (T input);
		bool remove (int pos);
		int length () const;
		bool isEmpty ();
		void makeEmpty();
		void printlist();
		bool search(ITEMTYPE input);
		int itempos(ITEMTYPE input);
	private:
		T item[MAXLEN];
		int len;
};
#endif */
Bazzy (6281)
Remember that "string" is in the std namespace

(Edit: Too slow in typing)
Last edited on
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