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diff --git a/q01_create_class/build.py b/q01_create_class/build.py
index a0188d6..d9b56c4 100644
--- a/q01_create_class/build.py
+++ b/q01_create_class/build.py
@@ -1,15 +1,66 @@
+# %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 '%s+%si' %(self.real, self.imag)
+
+    def __add__(self, other):
+        real_result = self.real + other.real
+        imaginary_result = self.imag + other.imag
+        return complex_number(real_result, imaginary_result)
+
+    def __sub__(self, other):
+        real_result = self.real - other.real
+        imaginary_result = self.imag - other.imag
+        return complex_number(real_result, imaginary_result)
+
+    def __mul__(self, other):
+        r1 = self.real * other.real
+        r2 = self.real * other.imag
+        r3 = self.imag * other.real
+        r4 = self.imag * other.imag 
+        real = r1 + (r4*(-1))
+        imaginary = r2 + r3
+        return complex_number(real, imaginary)
+
+    def __truediv__(self, other):
+         #(a+bi)/(c+di)=(ac+bd)/c2+d2 + i(bc−ad )/ c2+d2
+        num1 = ((self.real*other.real)+(self.imag*other.imag))
+        deno = (other.real**2) + (other.imag**2)
+        num2 = ((self.imag*other.real)-(self.real*other.imag))
+        return num1/deno,num2/deno
+    
+    def abs(self):
+        return math.sqrt(self.real**2+self.imag**2)
+
+    def conjugate(self):
+        return self.real+ -self.imag
+
+    def argument(self):
+        result= math.degrees(math.atan(self.imag/self.real))
+        return result
+a = complex_number(4,4)
+b = complex_number(4,-3)
+
+c = complex_number(4,4)
+d = complex_number(4,-3)
+
+
+
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