unresolved externals Error in C++ Project

I wrote my project using a simple editor and I compile them by using Microsoft vc++ compiler through command line interface, I am getting the following error:

/out:Main.exe Main.obj

Main.obj : error LNK2019: unresolved
external symbol "public: void
__thiscall Ac count::debit(int)" (?debit@Account@@QAEXH@Z) referenced
in function _main

Main.obj : error LNK2019: unresolved

external symbol "public: int
__thiscall Acc ount::getBalance(void)" (?getBalance@Account@@QAEHXZ)
referenced in function _main

Main.obj : error LNK2019: unresolved
external symbol "public: __thiscall
Account ::Account(int)"
(??0Account@@QAE@H@Z) referenced in
function _main Main.exe : fatal error
LNK1120: 3 unresolved externals

Here is the code:

//File : Account.h
class Account{
    public:
        Account( int );
        void credit( int );
        void debit( int );

        int getBalance();
    private:
        int balance;
};

//File:Account.cpp


#include
using std::cout;
using std::endl;

#include "Account.h"

Account::Account( int initialbalance ){
    balance = 0;

    if( initialbalance > 0 )

        balance = initialbalance;

    if ( initialbalance < 0 )
        cout<<"Initial Balance is empty\n"<}

void Account::credit( int amount ){
        balance = balance + amount;
}


void Account::debit( int amount ){
        if( amount <= balance )
            balance = balance - amount;
        else
            cout<<"Debit amount exceed balance amount\n"<}

int Account::getBalance(){
        return balance;
}   

//File : Main.cpp
#include
using std::cout;
using std::endl;
using std::cin;


#include "Account.h"

int main(){
    Account obj(50);

    cout<<"Account balance Rs. "<    int withdraw;

    cout<<"Withdrawal amount for your account\n"<    cin>>withdraw;


    cout<<"Withdrawing ....."<    obj.debit( withdraw );

    cout<<"Final account balance : "<

    return 0;
}   

I have first compiled Account.cpp by using "cl /LD Account.cpp" , then when i try to compile "Main.cpp" I get these error , to be specific I want to know how to use a compiled .dll or .obj file in my client code that uses these compiled files when their source code is not available .

Thanks in advance.

Answer

Apparently you have forgotten to include the Account.obj in your command line arguments: /out:Main.exe Main.obj Account.obj