diff --git a/src/prob1/Member.java b/src/prob1/Member.java
index a53fede..f164fdf 100644
--- a/src/prob1/Member.java
+++ b/src/prob1/Member.java
@@ -1,4 +1,28 @@
 package prob1;
 
 public class Member {
+	
+	private String id;
+	private String name;
+	private int point;
+	public String getId() {
+		return id;
+	}
+	public void setId(String id) {
+		this.id = id;
+	}
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	public int getPoint() {
+		return point;
+	}
+	public void setPoint(int point) {
+		this.point = point;
+	}
+	
+	
 }
diff --git a/src/prob2/Goods.java b/src/prob2/Goods.java
index ad87ad4..d895d53 100644
--- a/src/prob2/Goods.java
+++ b/src/prob2/Goods.java
@@ -1,5 +1,19 @@
 package prob2;
 
 public class Goods {
+	String name;
+	int price;
+	int stock;
+	public Goods(String name, int price, int stock) {
+		super();
+		this.name = name;
+		this.price = price;
+		this.stock = stock;
+	}
+	
+	
 
+	public String toString() {
+		return name +"(가격:"+price+"원)이 "+stock+"개 입고 되었습니다.";
+	}
 }
diff --git a/src/prob2/GoodsApp.java b/src/prob2/GoodsApp.java
index c084690..0abc0f1 100644
--- a/src/prob2/GoodsApp.java
+++ b/src/prob2/GoodsApp.java
@@ -6,6 +6,15 @@ public class GoodsApp {
 	private static final int COUNT_GOODS = 3;
 
 	public static void main(String[] args) {
-
+		
+		Scanner s = new Scanner(System.in);
+		Goods[] goods = new Goods[COUNT_GOODS];
+		for(int i = 0 ; i<COUNT_GOODS; i++) {
+			goods[i] = new Goods(s.next(), s.nextInt(), s.nextInt());
+		}
+		
+		for(int i = 0 ; i<COUNT_GOODS; i++) {
+			System.out.println(goods[i]);
+		}
 	}
 }
diff --git a/src/prob3/CurrencyConverter.java b/src/prob3/CurrencyConverter.java
index 3469d56..a3be454 100644
--- a/src/prob3/CurrencyConverter.java
+++ b/src/prob3/CurrencyConverter.java
@@ -1,4 +1,22 @@
 package prob3;
 
 public class CurrencyConverter {
+
+	static double rate;
+	
+	public static void setRate(double d) {
+		rate =d;
+		
+	}
+
+	public static double toDollar(int i) {
+		// TODO Auto-generated method stub
+		return i/rate;
+	}
+
+	public static double toKRW(int i) {
+		// TODO Auto-generated method stub
+		return i*rate;
+	}
+	
 }
diff --git a/src/prob3/Prob3.java b/src/prob3/Prob3.java
index cdb5014..2931623 100644
--- a/src/prob3/Prob3.java
+++ b/src/prob3/Prob3.java
@@ -1,3 +1,4 @@
+
 package prob3;
 
 public class Prob3 {
@@ -12,3 +13,4 @@ public static void main(String[] args) {
 		System.out.println( "백달러는 " + krw + "원 입니다." );		
 	}
 }
+
diff --git a/src/prob4/StringUtil.java b/src/prob4/StringUtil.java
index 6a66366..d420459 100644
--- a/src/prob4/StringUtil.java
+++ b/src/prob4/StringUtil.java
@@ -2,4 +2,13 @@
 
 public class StringUtil {
 
+	public static String concatenate(String[] strArr) {
+		// TODO Auto-generated method stub
+		String str  = "";
+		for(int i = 0 ; i < strArr.length ; i++) {
+			str += strArr[i];
+		}
+		return str;
+	}
+
 }
diff --git a/src/prob5/Account.java b/src/prob5/Account.java
index d9f57b1..8579335 100644
--- a/src/prob5/Account.java
+++ b/src/prob5/Account.java
@@ -1,4 +1,36 @@
 package prob5;
 
 public class Account {
+	
+	private String accountNo;
+	private int balance;
+	
+	
+	public Account(String string) {
+		// TODO Auto-generated constructor stub
+		accountNo = string;
+		
+		System.out.println(accountNo +" 계좌가 개설되었습니다.");
+	}
+
+	public String getAccountNo() {
+		// TODO Auto-generated method stub
+		return accountNo;
+	}
+
+	public int getBalance() {
+		// TODO Auto-generated method stub
+		return balance;
+	}
+
+	public void save(int i) {
+		balance+=i;
+		System.out.println(accountNo +" 계좌에 "+i+"만원이 입금되었습니다.");
+	}
+
+	public void deposit(int i) {
+		balance-=i;
+		System.out.println(accountNo +" 계좌에 "+i+"만원이 출금되었습니다.");
+		
+	}
 }
\ No newline at end of file
diff --git a/src/prob5/AccountTest.java b/src/prob5/AccountTest.java
index f0ba6f0..1789707 100644
--- a/src/prob5/AccountTest.java
+++ b/src/prob5/AccountTest.java
@@ -5,13 +5,13 @@ public class AccountTest {
 	public static void main(String[] args) {
 		
 		Account account = new Account( "078-3762-293" );
-		System.out.println( account.getAccountNo() + "계좌의 잔고는 " + account.getBalance() + "만원입니다." );
+		System.out.println( account.getAccountNo() + " 계좌의 잔고는 " + account.getBalance() + "만원입니다." );
 		
 		account.save( 100 );
-		System.out.println( account.getAccountNo() + "계좌의 잔고는 " + account.getBalance() + "만원입니다." );
+		System.out.println( account.getAccountNo() + " 계좌의 잔고는 " + account.getBalance() + "만원입니다." );
 
 		account.deposit( 30 );
-		System.out.println( account.getAccountNo() + "계좌의 잔고는 " + account.getBalance() + "만원입니다." );
+		System.out.println( account.getAccountNo() + " 계좌의 잔고는 " + account.getBalance() + "만원입니다." );
 
 	}
 
diff --git a/src/prob6/Add.java b/src/prob6/Add.java
new file mode 100644
index 0000000..61e569a
--- /dev/null
+++ b/src/prob6/Add.java
@@ -0,0 +1,13 @@
+package prob6;
+
+public class Add {
+	int a;
+	int b;
+	void setValue(int a,int b) {
+		this.a = a;
+		this.b =b;
+	}
+	int calculate() {
+		return a+b;
+	}
+}
diff --git a/src/prob6/CalcApp.java b/src/prob6/CalcApp.java
index a000723..56a8146 100644
--- a/src/prob6/CalcApp.java
+++ b/src/prob6/CalcApp.java
@@ -5,13 +5,37 @@
 public class CalcApp {
 
 	public static void main(String[] args) {
+		Add add = new Add();
+		Div div = new Div();
+		Mul mul = new Mul();
+		Sub sub = new Sub();
+		
 		Scanner scanner = new Scanner(System.in);
 		
 		while( true ) {
 			
 			System.out.print( ">> " );
 			String expression = scanner.nextLine();
-
+			
+			expression=expression.replaceAll(" ", "");
+			
+			if(expression.contains("quit")) {
+				break;
+			}
+			else if(expression.contains("+")) {
+				add.setValue(Integer.parseInt(expression.substring(0,expression.indexOf("+"))),Integer.parseInt(expression.substring(expression.indexOf("+")+1)));
+				System.out.println(add.calculate());
+			}else if(expression.contains("-")) {
+				sub.setValue(Integer.parseInt(expression.substring(0,expression.indexOf("-"))),Integer.parseInt(expression.substring(expression.indexOf("-")+1)));
+				System.out.println(sub.calculate());
+			}else if(expression.contains("*")) {
+				mul.setValue(Integer.parseInt(expression.substring(0,expression.indexOf("*"))),Integer.parseInt(expression.substring(expression.indexOf("*")+1)));
+				System.out.println(mul.calculate());
+			}else if(expression.contains("/")) {
+				div.setValue(Integer.parseInt(expression.substring(0,expression.indexOf("/"))),Integer.parseInt(expression.substring(expression.indexOf("/")+1)));
+				System.out.println(div.calculate());
+			}
+			
 			/*  코드를 완성 합니다 */
 			
 		}
diff --git a/src/prob6/Div.java b/src/prob6/Div.java
new file mode 100644
index 0000000..6e6bed3
--- /dev/null
+++ b/src/prob6/Div.java
@@ -0,0 +1,13 @@
+package prob6;
+
+public class Div {
+	int a;
+	int b;
+	void setValue(int a,int b) {
+		this.a = a;
+		this.b =b;
+	}
+	int calculate() {
+		return a/b;
+	}
+}
diff --git a/src/prob6/Mul.java b/src/prob6/Mul.java
new file mode 100644
index 0000000..4236c67
--- /dev/null
+++ b/src/prob6/Mul.java
@@ -0,0 +1,13 @@
+package prob6;
+
+public class Mul {
+	int a;
+	int b;
+	void setValue(int a,int b) {
+		this.a = a;
+		this.b =b;
+	}
+	int calculate() {
+		return a*b;
+	}
+}
diff --git a/src/prob6/Sub.java b/src/prob6/Sub.java
new file mode 100644
index 0000000..12fa925
--- /dev/null
+++ b/src/prob6/Sub.java
@@ -0,0 +1,13 @@
+package prob6;
+
+public class Sub {
+	int a;
+	int b;
+	void setValue(int a,int b) {
+		this.a = a;
+		this.b =b;
+	}
+	int calculate() {
+		return a-b;
+	}
+}