From 5f88b6447a3461a53207affb6713ffa7e15c7079 Mon Sep 17 00:00:00 2001
From: Samruddhi Ghodake <72791227+samughodake@users.noreply.github.com>
Date: Tue, 28 Sep 2021 18:25:54 +0530
Subject: [PATCH] chore(CPlusPlus): add reverse digits (#492)

---
 algorithms/CPlusPlus/Maths/reverse-digits.cpp | 47 +++++++++++++++++++
 algorithms/CPlusPlus/README.md                |  1 +
 2 files changed, 48 insertions(+)
 create mode 100644 algorithms/CPlusPlus/Maths/reverse-digits.cpp

diff --git a/algorithms/CPlusPlus/Maths/reverse-digits.cpp b/algorithms/CPlusPlus/Maths/reverse-digits.cpp
new file mode 100644
index 00000000..78417156
--- /dev/null
+++ b/algorithms/CPlusPlus/Maths/reverse-digits.cpp
@@ -0,0 +1,47 @@
+/*
+Description: A program to reverse the digits of a number.
+
+Approach: Running a while loop over number till it becomes 0
+Multiplying the result variable to 10 each time.
+Taking the modulus of number at every iteration and adding it to the final result to generate the reverse.
+Dividing the number by 10 at every iteration.
+*/
+
+#include <iostream>
+using namespace std;
+
+//function
+long reverse_digit(long n)
+{
+    //result variable
+    long num = 0;
+    while (n != 0)
+    {
+        //storing the last digit of n in temp variable
+        long temp = n % 10;
+        //multiplying the num variable into 10 and adding temp value to it
+        num = num * 10 + temp;
+        //Dividing n by 10 at each iteration
+        n = n / 10;
+    }
+    return num;
+}
+
+//main starts
+int main()
+{
+    cout << "Enter a number\n";
+    long n;
+    cin >> n;
+    cout << "Reverse number is: ";
+    cout << reverse_digit(n);
+}
+
+/*
+Input: 
+Enter a number
+1234
+
+Output:
+Reverse number is: 4321
+*/
\ No newline at end of file
diff --git a/algorithms/CPlusPlus/README.md b/algorithms/CPlusPlus/README.md
index 1b7052cf..0cf38bcf 100644
--- a/algorithms/CPlusPlus/README.md
+++ b/algorithms/CPlusPlus/README.md
@@ -123,6 +123,7 @@
 3. [Prime Sieve](Maths/prime-sieve.cpp)
 4. [Fibonacci Series](Maths/fibonaccci-series.cpp)
 5. [Armstrong Number](Maths/armstrong.cpp)
+6. [Reverse digit of a number](Maths/reverse-digits.cpp)
 
 # Recursion