From 14c1a7faa14a58198b1ea1b918f9cc6da2a9175c Mon Sep 17 00:00:00 2001
From: muskan0719 <53470969+muskan0719@users.noreply.github.com>
Date: Wed, 21 Oct 2020 14:52:55 +0530
Subject: [PATCH] update sum_of_binomial_coefficients

---
 math/sum_of_binomial_coefficient.cpp | 61 +++++++++++++++++-----------
 1 file changed, 37 insertions(+), 24 deletions(-)

diff --git a/math/sum_of_binomial_coefficient.cpp b/math/sum_of_binomial_coefficient.cpp
index 28052c271..ed772b972 100644
--- a/math/sum_of_binomial_coefficient.cpp
+++ b/math/sum_of_binomial_coefficient.cpp
@@ -1,17 +1,17 @@
 /**
  * @file
- * \@brief Program to find sum of binomial coefficients of a given positive integer.
- * Given a positive integer n, the task is to find the sum of binomial coefficient i.e
- * nC0 + nC1 + nC2 + ……. + nCn-1 + nCn
+ * @brief Algorithm to find sum of binomial coefficients of a given positive integer.
+ * @details Given a positive integer n, the task is to find the sum of binomial coefficient i.e
+ * nC0 + nC1 + nC2 + ……. + nCn-1 + nCn
  * By induction, we can prove that the sum is equal to 2^n
- * [https://en.wikipedia.org/wiki/Binomial_coefficient#Sums_of_the_binomial_coefficients]
- * @author muskan0719[https://github.com/muskan0719]
+ * @source https://en.wikipedia.org/wiki/Binomial_coefficient#Sums_of_the_binomial_coefficients
+ * @author muskan0719 [https://github.com/muskan0719]
  */
-#include<iostream>
-#include<cassert>
-using namespace std; 
+#include<iostream> /// for std::cin and std::cout
+#include<cassert>  /// for assert
 
 /** 
+ * Function to calculate sum of binomial coefficients
  * @param n number
  * @return Sum of binomial coefficients of number 
  */
@@ -20,28 +20,41 @@ int binomialCoeffSum(int n)
     //Calculating 2^n  
 	return (1 << n); 
 }
+
 /**
- * Function for testing the binomialCoeffSum() function
- */ 
+ * Function for testing binomialCoeffSum function.
+ * test cases and assert statement.
+ * @returns `void`
+*/
 static void test()
 {
-	int test_case_1=binomialCoeffSum(4);
-	assert(test_case_1==16);
-	cout<<"Test_case_1 Passed!"<<endl;
-	int test_case_2=binomialCoeffSum(5);
-	assert(test_case_2==32);
-	cout<<"Test_case_2 Passed!"<<endl;
+	int test_case_1 = binomialCoeffSum(2);
+	assert(test_case_1==4);
+	std::cout<<"Test_case_1 Passed!"<<std::endl;
+	
+	int test_case_2 = binomialCoeffSum(3);
+	assert(test_case_2==8);
+	std::cout<<"Test_case_2 Passed!"<<std::endl;
+	
+	int test_case_3 = binomialCoeffSum(4);
+	assert(test_case_3==16);
+	std::cout<<"Test_case_3 Passed!"<<std::endl;
+	
+	int test_case_4 = binomialCoeffSum(5);
+	assert(test_case_4==32);
+	std::cout<<"Test_case_4 Passed!"<<std::endl;
+	
+	int test_case_5 = binomialCoeffSum(7);
+	assert(test_case_5==128);
+	std::cout<<"Test_case_5 Passed!"<<std::endl;
  } 
 
-/* Main function*/
+/**
+ * @brief Main function
+ * @returns 0 on exit
+ */
 int main() 
 { 
-    test();
-	int number;
-	cout<<"Enter the value of n"<<endl;
-	cin>>number;
-	assert(number>=0);
-    cout<<"Sum of binomial coefficient is "<<binomialCoeffSum(number)<<endl;
+    test(); // execute the tests
 	return 0; 
 } 
-