diff --git a/W4_Q1_Pass_Generator.py b/W4_Q1_Pass_Generator.py
new file mode 100644
index 0000000..6205042
--- /dev/null
+++ b/W4_Q1_Pass_Generator.py
@@ -0,0 +1,57 @@
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#   PyCoder Coding Class:4         @
+#   Cabir Erguven                  @
+#   Week        : 4                @
+#   Question    : 1                @
+#   Date: 30.01.2021               @
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#
+#  Random Password Generator
+#
+# Generate random password and display the result on user interface.
+# So that I can generate my password for any application.
+#
+# Acceptance Criteria:
+#
+#     Password length must be 10 characters long.
+#     It must contain at least 2 upper case letter, 2 digits and 2 special symbols.
+#     You must import some required modules or packages.
+#     The GUI of program must contain at least a button and a label.
+#     The result should be display on the password label when the user click the generate button.
+
+import random
+import tkinter as tk
+
+def generate():
+    names_upper = " ABCDEFGHIJKLMNOPRSTUVXYZ"
+    names_lower = "abcdefghijklmnoprstuvxyz"
+    spe_char = "!@$%&*_-+="
+    digits ="1234567890"
+
+    result_lower = random.sample(names_lower,3)
+    result_upper = random.sample(names_upper,3)
+    result_char = random.sample(spe_char,2)
+    result_num = random.sample(digits,2)
+
+    join_list = result_lower+result_upper+result_char+result_num
+    random.shuffle(join_list)
+    a = ("".join(join_list))
+
+    message2 = tk.Label(root, text=a)
+    message2.pack()
+
+
+root = tk.Tk()
+root.title("Password Generator")
+
+# Instruction
+message = tk.Label(root,text="  Please click the Generate button for your password  ")
+message.pack()
+root.geometry("300x350")
+
+# Generate button
+generateButton = tk.Button(root, bg="red", text="Generate", command=lambda:generate())
+generateButton.pack()
+
+root.mainloop()
+
diff --git a/W4_Q2_LCM.py b/W4_Q2_LCM.py
new file mode 100644
index 0000000..50dba2e
--- /dev/null
+++ b/W4_Q2_LCM.py
@@ -0,0 +1,40 @@
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#   PyCoder Coding Class:4         @
+#   Cabir Erguven                  @
+#   Week        : 4                @
+#   Question    : 2                @
+#   Date: 30.01.2021               @
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#
+# Calculate the least common multiple (L.C.M.) of four numbers.
+# So that I can find the least common multiple (L.C.M.) of my inputs.
+#
+# Acceptance Criteria:
+#
+#     Ask user to enter the four numbers.
+#     Use try/except blocks to verify input entries and warn the user for Nan or non numerical inputs.
+#     Calculate the least common multiple (L.C.M.) of four numbers
+#     Use gcd function in module of math
+
+import math
+list = []
+res = 1
+a = 0
+
+
+for x in range(4):
+    while True:
+        try:
+            a = int(input("Enter four numbers to calculate their LCM: "))
+            break
+        except ValueError:
+            print("You entered NaN, please enter the numbers correctly")
+
+
+    list.append(a)
+
+lcf_step1 = int((list[0] * list[1]) / math.gcd(list[0], list[1]))   # recursive can be used
+lcf_step2 = int((lcf_step1 * list[2]) / math.gcd(lcf_step1, list[2]))
+lcf_step3 = int((lcf_step2 * list[3]) / math.gcd(lcf_step2, list[3]))
+
+print("LCF of", list[0], list[1], list[2], list[3], "is:", lcf_step3)
diff --git a/W4_Q3_Guess_the_number.py b/W4_Q3_Guess_the_number.py
new file mode 100644
index 0000000..342fbe1
--- /dev/null
+++ b/W4_Q3_Guess_the_number.py
@@ -0,0 +1,67 @@
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#   PyCoder Coding Class:4         @
+#   Cabir Erguven                  @
+#   Week        : 4                @
+#   Question    : 3                @
+#   Date: 30.01.2021               @
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#
+#  Number Guessing Game
+#
+# Guess a number the computer chooses in the range I chose.
+# So that I can try to find the correct number which was selected by computer.
+#
+# Acceptance Criteria:
+#
+#     Computer must randomly pick an integer from user selected a range,
+#     i.e., from A to B, where A and B belong to Integer.
+#     Your program should prompt the user for guesses
+#     if the user guesses incorrectly, it should print whether the guess is too high or too low.
+#     If the user guesses correctly, the program should print total time and total number of guesses.
+#     You must import some required modules or packages
+#     You can assume that the user will enter valid input.
+
+from timeit import default_timer as timer
+import random
+
+print("******* GUESS THE NUMBER *******")
+print("Enter the range of the number you want to find")
+
+while True:
+    try:
+        begin = int(input("Enter the first number: "))
+        finish = int(input("Enter the last number: "))
+        break
+    except ValueError:
+        print("Please enter only number")
+
+
+start = timer()
+number = random.randint(begin, finish)
+count = 0
+guess = []
+
+while guess != number:
+    count += 1
+
+    # try:
+    #     guess = int(input("Please enter a number: "))
+    # except ValueError:
+    #     print("Please enter a valid number!")
+
+    try:
+        guess = int(input("\nEnter your guess: "))
+
+        if guess > number:
+            print(" It is too high")
+        elif guess < number:
+                print(" It is too low")
+        else:
+            print("\nCongratulation!!!")
+            print("You guessed in",count,"times.")
+
+    except (ValueError, TypeError):
+        print("Please enter a valid number")
+
+end = timer()
+print("It took", round((end - start), 2), "seconds to finish the game!")
diff --git a/W4_Q4__Calculator.py b/W4_Q4__Calculator.py
new file mode 100644
index 0000000..ead2de3
--- /dev/null
+++ b/W4_Q4__Calculator.py
@@ -0,0 +1,53 @@
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#   PyCoder Coding Class:4         @
+#   Cabir Erguven                  @
+#   Week        : 4                @
+#   Question    : 4                @
+#   Date: 30.01.2021               @
+#C@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@1
+#
+# Mis Calculator
+#
+# A program which can calculate basic mathematical operations.
+# So that I can add, subtract, multiply or divide my inputs.
+#
+# Acceptance Criteria:
+#
+#     The calculator must support the Addition, Subtraction, Multiplication and Division operations.
+#     Define four functions in four files for each of them, with two float numbers as parameters.
+#     To calculate the answer, use math.ceil()  and get the next integer value greater than the result
+#     Create a menu using the print command with the respective options and take an input choice from the user.
+#     Using if/elif statements for cases and call the appropriate functions.
+#     Use try/except blocks to verify input entries and warn the user for incorrect inputs.
+#     Ask user if calculate numbers again. To implement this, take the input from user Y or N.
+
+import math
+import add_of_calculator as a, subtract_of_calculator as s, multiply_of_calculator as m, divide_of_calculator as d
+while True:
+    operation_list = ["+","-","*", "/"]
+    operation = input("Which operation do you want to perform ' + - * / ' ?")
+
+    if operation not in operation_list:
+        print("Operation is INVALID! \nEnter only the following symbols ' + - * / ' ")
+        break
+    try:
+        first = int(input("enter first number: "))
+        second = int(input("enter second number: "))
+    except (ValueError, NameError):
+        print("Please Enter only number")
+        break
+
+    if operation == "+":
+        print("The result is: ",math.ceil(a.add(first,second)))
+    elif operation == "-":
+        print("The result is: ",math.ceil(s.subtract(first,second)))
+    elif operation == "*":
+        print("The result is: ",math.ceil(m.multiply(first,second)))
+    elif operation == "/":
+        print("The result is: ",math.ceil(d.divide(first,second)))
+
+    answer = input("\nDo you want to perform more operation? [Y /N]")
+    if answer == ("n" or "N"):
+        print ("See you again! ")
+        break
+
diff --git a/W4_Q4_add_of_calculator.py b/W4_Q4_add_of_calculator.py
new file mode 100644
index 0000000..bf4667a
--- /dev/null
+++ b/W4_Q4_add_of_calculator.py
@@ -0,0 +1,3 @@
+def add(a,b):
+    result = float(a) + float (b)
+    return result
\ No newline at end of file
diff --git a/W4_Q4_divide_of_calculator.py b/W4_Q4_divide_of_calculator.py
new file mode 100644
index 0000000..d658011
--- /dev/null
+++ b/W4_Q4_divide_of_calculator.py
@@ -0,0 +1,3 @@
+def divide(a,b):
+    result = float(a) / float (b)
+    return  result
\ No newline at end of file
diff --git a/W4_Q4_multiply_of_calculator.py b/W4_Q4_multiply_of_calculator.py
new file mode 100644
index 0000000..a027791
--- /dev/null
+++ b/W4_Q4_multiply_of_calculator.py
@@ -0,0 +1,3 @@
+def multiply(a,b):
+    result = float(a) * float (b)
+    return result
\ No newline at end of file
diff --git a/W4_Q4_subtract_of_calculator.py b/W4_Q4_subtract_of_calculator.py
new file mode 100644
index 0000000..3a83a06
--- /dev/null
+++ b/W4_Q4_subtract_of_calculator.py
@@ -0,0 +1,3 @@
+def subtract(a,b):
+    result = float(a) - float (b)
+    return result
\ No newline at end of file
diff --git a/W4_Q5_Password_Generator_Package.py b/W4_Q5_Password_Generator_Package.py
new file mode 100644
index 0000000..b7e7635
--- /dev/null
+++ b/W4_Q5_Password_Generator_Package.py
@@ -0,0 +1,9 @@
+'''
+You tube videolari indirmek icin
+'''
+
+
+
+def download_link():
+    return
+