Merge pull request #1066 from srinivas892/main

Create Reverse_Integer.cpp

Author: akgmage

Math/Reverse_Integer.cpp

@@ -0,0 +1,37 @@
+/* Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0.
+
+Assume the environment does not allow you to store 64-bit integers (signed or unsigned).
+Example 1:
+
+Input: x = 123
+Output: 321
+Example 2:
+
+Input: x = -123
+Output: -321
+Example 3:
+
+Input: x = 120
+Output: 21
+ 
+
+Constraints:
+
+-2^31 <= x <= 2^31  - 1
+*/ 
+// function for reversing the integer;
+
+  int reverse(int x) {
+        int ans =0;
+        if(x > INT_MAX || x < INT_MIN) // checking the integer is in range of -2^31 <= x <= 2^31  - 1
+           return 0;  
+        while(x != 0){
+        if(ans > INT_MAX/10 || ans < INT_MIN/10) // -2^31 <= x <= 2^31  - 1 this condition for border values of range
+           return  0;
+            ans =  ans*10; // we increaing the unit position each itereation
+            ans += x%10;   // here we finding the last unit elemet so that we can add in ans
+            x /=10;   // decreamenting the value or we can say elemenating the last unit element that we are find
+
+        }
+        return ans;  // returning the ans;
+    }