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diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..98aad23 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,58 @@
+# %load q01_create_class/build.py
 import pandas as pd
 import numpy as np
 import math
+from math import pow
 
-"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 =0.0):
+        self.real = real
+        self.imag = imag
+    def __str__(self):
+        if self.imag<0:
+            return '{0}-{1}i'.format(self.real,self.imag)
+        else:
+            return '{0}+{1}i'.format(self.real,self.imag)
+            
+        
+    
+    def __add__(self, num):
+        return complex_number(self.real + num.real, self.imag + num.imag)
+    def __sub__(self, num):
+        return complex_number(self.real - num.real, self.imag - num.imag)
+    
+    def __mul__(self, num):
+        return complex_number(self.real * num.real - self.imag * num.imag , self.imag * num.imag + self.real * num.real)
+    
+    def __truediv__(self, num):
+        return ((self.real * num.real + self.imag * num.imag)/(num.real * num.real + num.imag*num.imag),
+               (self.imag * num.real - self.imag * num.imag)/(num.real * num.real + num.imag * num.imag))
+    def abs(self):
+        return math.sqrt(self.real**2 + self.imag**2)
+    def conjugate(self):
+        return complex_number(self.real , -self.imag)
+    def argument(self):
+        return math.degrees(math.atan(self.real/self.imag))
+ 
+
+a = complex_number(4,4)
+b = complex_number(4,-3)
+
+c = complex_number(4,4)
+d = complex_number(4,-3)
+
+
+
+
+
+
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