diff --git a/__pycache__/__init__.cpython-36.pyc b/__pycache__/__init__.cpython-36.pyc
index a600305..d19af69 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..0a1154b 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..926a163 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..d0fe3db 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,56 @@
+# %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 __add__(self, other):
+        x=self.real+other.real
+        y=self.imag+other.imag
+        return complex_number(x,y)
+    
+    def __sub__(self,other):
+        x=self.real-other.real
+        y=self.imag-other.imag
+        return complex_number(x,y)
+    
+    def __mul__(self,other):
+        x=(self.real*other.real)-(self.imag*other.imag)
+        y= (other.real*self.imag)+(self.real*other.imag)
+        return complex_number(x,y)
+    
+    def __truediv__(self,other):
+        x=((self.real*other.real)+(self.imag*other.imag))/((other.real**2+ other.imag**2))
+        y=((self.imag*other.real)-(self.real*other.imag))/((other.real**2+ other.imag**2))
+        return x,y
+   
+    def __str__(self):
+        if '-' in str(self.imag):
+            return '{0}-i{1}'.format(self.real,-self.imag)
+        else :
+            return '{0}+i{1}'.format(self.real,self.imag)
+    
+    def abs(self):
+        return (math.sqrt(float(self.real)**2+float(self.imag)**2))
+
+    def conjugate(self):
+        return complex_number((self.real),(self.imag*-1))
+    
+    def argument(self):
+        return math.degrees(math.atan(self.imag/self.real))
+
+
diff --git a/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc b/q01_create_class/tests/__pycache__/__init__.cpython-36.pyc
index 58575f1..716603c 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..00d5d42 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