diff --git a/__pycache__/__init__.cpython-36.pyc b/__pycache__/__init__.cpython-36.pyc
index a600305..3bb45f6 100644
Binary files a/__pycache__/__init__.cpython-36.pyc and b/__pycache__/__init__.cpython-36.pyc differ
diff --git a/q01_create_class/__pycache__/__init__.cpython-36.pyc b/q01_create_class/__pycache__/__init__.cpython-36.pyc
index 09a1efa..e9cc5ca 100644
Binary files a/q01_create_class/__pycache__/__init__.cpython-36.pyc and b/q01_create_class/__pycache__/__init__.cpython-36.pyc differ
diff --git a/q01_create_class/__pycache__/build.cpython-36.pyc b/q01_create_class/__pycache__/build.cpython-36.pyc
index 9f53117..ed8d6de 100644
Binary files a/q01_create_class/__pycache__/build.cpython-36.pyc and b/q01_create_class/__pycache__/build.cpython-36.pyc differ
diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..93cec1f 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,60 @@
+# %load q01_create_class/build.py
 import pandas as pd
 import numpy as np
 import math
 
-"write your solution here"
+'write your solution here'
 
 
 class complex_number:
-    """The complex number class.
+    '''The complex number class.
 
     Attributes:
     attr1 (x): Real part of complex number.
     attr2 (y): Imaginary part of complex number.
 
-    """
+    '''
+    def __init__(self,real,imag):
+        self.real=real
+        self.imag=imag
+    
+    def __str__(self):
+        return str(('%s+%si'))%(self.real,self.imag)
+    
+    #Addition of two complex numbers
+    def __add__(self, other):
+        return complex_number(self.real+other.real , self.imag+other.imag)
+    
+    
+    #Subtraction of two complex numbers
+    def __sub__(self, other):
+        return complex_number(self.real-other.real , self.imag-other.imag)
+    
+    
+    #Multiplication of two complex numbers
+    def __mul__(self, other):
+        return complex_number((self.real*other.real-self.imag*other.imag),(self.imag*other.real+self.real*other.imag))
+    
+    
+    #Division of two complex numbers
+    def __truediv__(self, other):
+        return ((self.real*other.real + self.imag*other.imag)/(other.real*other.real + other.imag*other.imag),
+                              (self.imag*other.real - self.imag*other.imag)/(other.real*other.real + other.imag*other.imag))
+
+    
+    #Absolute of two numbers
+    def abs(self):
+        return math.sqrt(self.real**2 + self.imag**2)
+    
+    #Conjugate of complex number
+    def conjugate(self):
+        return (-self.real,-self.imag)
+    
+    #Arg of Complex number
+    def argument(self):
+        return math.degrees(math.atan(self.real/self.imag))
+a=complex_number(4,4)
+b=complex_number(4,-3)
+c=a/b
+print(c)
+
diff --git a/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc b/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc
index 58575f1..ecb24af 100644
Binary files a/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc and b/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc differ
diff --git a/q01_create_class/tests/__pycache__/test_complex_number.cpython-36.pyc b/q01_create_class/tests/__pycache__/test_complex_number.cpython-36.pyc
index b378e09..d885abf 100644
Binary files a/q01_create_class/tests/__pycache__/test_complex_number.cpython-36.pyc and b/q01_create_class/tests/__pycache__/test_complex_number.cpython-36.pyc differ