diff --git a/Melati Anggraini_Institut Teknologi Bandung/README.md b/Melati Anggraini_Institut Teknologi Bandung/README.md
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+Penjelasan Program Hands On OOP
+Nama : Melati Anggraini ID GDSC : 220020111 Kampus : ITB
+
+Bahasa
+Bahasa yang digunakan adalah C++
+Versi compiler: C++ 17
+Deskripsi Singkat Tugas
+Program ini saya beri judul "Mesin ATM".
+Pembuatan program ini dimulai dengan class atm.
+Ada class saving yang merupakan turunan dari class atm.
+
+Cara Menjalankan Program
+Pertama, user akan memasukkan PIN dan Account Number. Jika sudah sesuai, maka user akan diberi 5 piihan menu yaitu menu Check Balance, Cash Withdraw, Show User Details, Update Mobile No, dan Exit. Jika sudah selesai user akan kembali ke menu awal.
+
+Design Pattern yang Digunakan
+Decorator (Structural Pattern)
+Decorator
+Penjelasan: Dekorator merupakah pola struktural yang memungkinkan menambah perilaku baru yang dapat menempatkan fungsi baru secara dinamis tanpa mengubah strukturnya.
+Letak Implementasi: method setMobile() dan method cashWithDraw (pada line 59 - line 83)
+Alasan Pemilihan: agar dapat mengupdate mobile number dengan pengecekan nomor sebelumnya(mobileNo)dan bisa menarik uang dengan pengecekan balance yang tersedia sehingga dua proses ini tidak akan mengubah struktur di fungsi utama.
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diff --git a/Melati Anggraini_Institut Teknologi Bandung/atm.cpp b/Melati Anggraini_Institut Teknologi Bandung/atm.cpp
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+++ b/Melati Anggraini_Institut Teknologi Bandung/atm.cpp	
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+#include<iostream>
+#include<conio.h>
+#include<string>
+using namespace std;
+
+// Mini Project - ATM
+// > Check Balance 
+// > Cash withdraw 
+// > User Details 
+// Update Mobile No.
+
+class atm{
+private :										// variabel privat pengguna
+	long int account_No; 
+	string name;
+	int PIN;
+	double balance;
+	string mobileNo;
+	
+public : 									// public member functions 
+ 	// setData function is setting the Data into the privat member variables
+ 	void setData (long int account_No_a, char string[4] name_a, int PIN_a, double balance_a, char string[8] mobileNo_a)
+ 	{
+ 		account_No = account_No_a   // assigment the formal argument to the privat member variable
+ 		name = name_a
+ 		PIN = PIN_a
+ 		balance = balance_a
+ 		mobile_No = mobile_No_a
+	}
+	
+	
+	// getAccountNo function is returning the user's account no.
+	long int getAccountNo()
+	{
+		return account_No;
+	}
+	
+	// getAccountNo function is returning the user's  Name 
+	string getName()
+	{
+		return name;
+	}
+	// getPIN function is returning the user's PIN
+	int getPIN()
+	{
+		return PIN ;
+	}
+	// getBalance function is returning the user's Bank Balance
+	double getBalance()
+	{
+		return balance;
+	}
+ 	// getMobileNo is returning the user's Mobile No. 
+ 	string getMobileNo()
+ 	{
+ 		return mobileNo;
+	}
+	
+	//setMobile function is updating the user mobile no.
+	void setMobile(string mob_prev, string mob_new)
+	{
+		if (mob_prev = mobileNo)    // it will check the old mobile no
+		{
+			mobileNo = mob_new   // Updated with new, if old matches
+			cout<< " Succesfully Update Mobile no. ";
+			_getch();				// getch is to hold screen (until user press any key)
+		
+		}
+		
+		else {
+			cout<< "Incorrect!!! Old Mobile no.";
+			_getch(); // getch is to hold the screen (until user press any key)
+		}
+	}
+	
+	//cashWithDraw function is used to withdraw money from ATM 
+	void casWithDraw(int amount_a){
+		if (amount_a>0) && (amount_a< balance) 	// check entered validity 
+		{
+			balance -= amount_a ;       		/// balance = balance-amount
+			cout<<endl<<  "Please Collect Your Cash";
+			cout<< endl<< "Available Balance"<< balance;
+			_getch();// getch is to hold the screen (until user press any key)
+			
+		}
+		
+		else{
+			cout<< "Invalid Input or Insufficient Balance ";
+			_getch();// getch is to hold the screen (until user press any key)
+		}
+	}
+};
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+int main(){
+	/// User Autentication
+	int choice = 0, enterPIN;
+	long int enterAccountNo;
+	
+	system("cls");
+	
+	
+	// Created user(Object)
+	atm user1;
+	//Set User Details (into object )      (Setting Default Data)
+	user1.setData(1234567, "Melati", 1111, 45000.09, "9087654321");
+	
+	
+	do {
+		system("cls");
+		
+		cout<<endl << "***Welcome to ATM***"<<endl;
+		cout<< endl<< "Enter Your Account No ";
+		cin>> enterAccountNo;						// asking user to enter account no 
+		
+		cout<< endl<< "Enter PIN";
+		cin>> enterPIN;								// asking user to enter PIN
+		
+		// check wether enter values matches with user details
+		if ((enterAccountNo = user1.getAccountNo()) && (enterPIN = user1.getPIN()))
+		{
+			do{
+				int amount = 0;
+				string oldMobieNo, newMobileNo;
+				
+				system("cls");
+				// user Interface
+				cout << endl<< ***Welcome to AMT***<< endl;
+				cout<< endl<< "Select Options "<<endl;
+				cout<< endl<< "1. Check Balance "<<endl;
+				cout<< endl<< "2. Cash WithDraw"<<endl;
+				cout<< endl<< "3. Show User Details"<<endl;
+				cout<< endl<< "4. Update Mobile No"<<endl;
+				cout<< endl<< "5. Exit "<<endl;
+				cin>> choice;						// taking user choice
+				
+				
+				switch (choice)
+				{
+					case 1 :						// if user presses 1
+						cout<< endl<< "Your Bank Balance is : "<< user1.getBalance();
+						
+					case 2 :
+						cout << "Enter the amount : ";
+						user1.casWithDraw(amount); 			// calling cashwithDraw function
+						
+						break ; // passing the withdraw amount
+						
+					case 3 :
+						cout<< "The Users Details are :-";
+						cout<< endl << "-> Account no "<< user1.getAccountNo();
+						cout <<endl<< "-> Name "<< user1.getName();
+						cout<< endl << "-> Balance"<< user1.getBalance();
+						cout<< endl << "-> Mobile No."<< user1.getMobileNo();
+						/// getting and printing user details
+						_getch(); 
+						break ; 
+					
+					case 4 :
+						cout<< "Enter Old Mobile No. ";
+						cin>> oldMobileNo;  			// take old mobile no
+					
+					case 5 : 
+						exit(0);						// exit application
+						
+					default :
+						cout<< endl<< "Enter Data Valid !!!!";
+				}
+			}while (1);						// MENU // condition will always TRUE and loop is capable of running
+				// infinite times
+				
+		}
+		else 
+		{
+			cout << endl << "User Details are Invalid !!!";
+			_getch();
+		}
+		
+	}while(1);					// LOGIN // MENU // condition will always TRUE and loop is capable of running
+				// infinite times...
+}
+