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diff --git a/q01_create_class/__pycache__/build.cpython-36.pyc b/q01_create_class/__pycache__/build.cpython-36.pyc
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diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..c847e9d 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,73 @@
+# %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.
+    def __init__(self, real = 0, imag = 0):
+        self.real = real
+        self.imag = imag
+
+    def __str__(self):
+        if self.imag<0:
+            return '{}-i{}'.format(self.real,abs(self.imag))
+        else:
+            return '{}+i{}'.format(self.real,self.imag)
+
+    def __add__(self,other):
+        c = self.real+other.real
+        d = self.imag+other.imag
+        return complex_number(c,d)
+
+    def __sub__(self,other):
+        c= self.real-other.real
+        d= self.imag-other.imag
+        return complex_number(c,d)
+
+    def __mul__(self,other):
+        c= (self.real*other.real - self.imag*other.imag)
+        d= (self.real*other.imag + self.imag*other.real)
+        return complex_number(c,d)
+
+    def __truediv__(self,other):
+        c= ((self.real*other.real+self.imag*other.imag))/(other.real**2+other.imag**2)
+        d= ((self.imag*other.real-self.real*other.imag))/(other.real**2+other.imag**2)
+        #return complex_number(c,d)
+        return c,d
+
+    def conjugate(self):
+        c = self.real
+        d = self.imag
+        return complex_number(c,-d)
+    
+    def abs(self):
+        c = (self.real**2+self.imag**2)**(1/2)
+        return c
+    
+    def argument(self):
+        c = math.degrees(np.arctan(self.real/self.imag))
+        return c
+    
+
+aa = complex_number(3,3)
+#bb = complex_number(9,9)
+#print(aa)
+#math.tanh
+#aa.abs()
+print(aa.argument())
+c1 = complex_number(4,4)
+c2 = complex_number(4,-3)
+print (c1)
+print (c2)
+print(c1+c2)
+print(c1-c2)
+print(c1*c2)
+print(c1/c2)
+print(c1.conjugate())
+print(c1.abs())
+print(c1.argument())
 
-    Attributes:
-    attr1 (x): Real part of complex number.
-    attr2 (y): Imaginary part of complex number.
 
-    """
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