From a60525edbc47bde83a15fc593383f6dee3798a44 Mon Sep 17 00:00:00 2001
From: devansh-07 <sonidev0201@gmail.com>
Date: Mon, 19 Oct 2020 11:02:25 +0530
Subject: [PATCH] Added 2's complement

---
 mathgenerator/funcs/__init__.py           |  1 +
 mathgenerator/funcs/binary2sComplement.py | 26 +++++++++++++++++++++++
 mathgenerator/mathgen.py                  |  1 +
 3 files changed, 28 insertions(+)
 create mode 100644 mathgenerator/funcs/binary2sComplement.py

diff --git a/mathgenerator/funcs/__init__.py b/mathgenerator/funcs/__init__.py
index efb1ce7..b43d727 100644
--- a/mathgenerator/funcs/__init__.py
+++ b/mathgenerator/funcs/__init__.py
@@ -71,3 +71,4 @@ from .multiplyComplexNumbersFunc import *
 from .geomProgrFunc import *
 from .geometricMeanFunc import *
 from .harmonicMeanFunc import *
+from .binary2sComplement import *
\ No newline at end of file
diff --git a/mathgenerator/funcs/binary2sComplement.py b/mathgenerator/funcs/binary2sComplement.py
new file mode 100644
index 0000000..f51b797
--- /dev/null
+++ b/mathgenerator/funcs/binary2sComplement.py
@@ -0,0 +1,26 @@
+from  .__init__ import *
+
+def binary2sComplementFunc(maxDigits=10):
+    digits = random.randint(1, maxDigits)
+    question = ''.join([str(random.randint(0, 1)) for i in range(digits)]).lstrip('0')
+
+    answer = []
+    for i in question:
+        answer.append(str(int(not bool(int(i)))))
+
+    carry = True
+    j = len(answer) - 1
+    while j >= 0:
+        if answer[j] == '0':
+            answer[j] = '1'
+            carry = False
+            break
+        answer[j] = '0'
+        j -= 1
+
+    if j == 0 and carry == True:
+        answer.insert(0, '1')
+
+    problem = "2's complement of " + question + " ="
+    solution = ''.join(answer).lstrip('0')
+    return problem, solution
\ No newline at end of file
diff --git a/mathgenerator/mathgen.py b/mathgenerator/mathgen.py
index 0e813a6..860c89b 100644
--- a/mathgenerator/mathgen.py
+++ b/mathgenerator/mathgen.py
@@ -156,3 +156,4 @@ complexNumMultiply = Generator("Multiplication of 2 complex numbers", 64, "(x +
 geometricprogression=Generator("Geometric Progression", 65, "Initial value,Common Ratio,nth Term,Sum till nth term =", "a,r,ar^n-1,sum(ar^n-1", geomProgrFunc)
 geometricMean=Generator("Geometric Mean of N Numbers",66,"Geometric mean of n numbers A1 , A2 , ... , An = ","(A1*A2*...An)^(1/n) = ans",geometricMeanFunc)
 harmonicMean=Generator("Harmonic Mean of N Numbers",67,"Harmonic mean of n numbers A1 , A2 , ... , An = "," n/((1/A1) + (1/A2) + ... + (1/An)) = ans",harmonicMeanFunc)
+binary2sComplement = Generator("Binary 2's Complement", 68, "2's complement of 11010110 = ", "101010", binary2sComplementFunc)
\ No newline at end of file