Leetcode day 2 and 3

leetcode/lc7/RevInt.cpp

@@ -0,0 +1,20 @@
+class Solution {
+public:
+    int reverse(int x) {
+       int rev =0;
+       while(x!=0){
+        int digit = x%10;
+        x/=10;
+        if(rev>INT_MAX/10 || rev==INT_MAX/10 && digit > 7){
+            return 0;
+        }
+        if(rev<INT_MIN/10 || rev==INT_MIN/10 && digit < -8){
+            return 0;
+        }
+        rev  = rev*10 + digit;
+
+       }
+       return rev;
+
+    }
+};

leetcode/lc7/notes.md

@@ -0,0 +1,13 @@
+INT_MAX, INT_MIN are called integer limit macros or more generally type limit constants.(compile-time constants)
+defined in #include <climits>
+
+Modern Alternative:
+
+#include <limits>
+
+numeric_limits<int>::max();
+numeric_limits<int>::min();
+
+int maxInt = std::numeric_limits<int>::max();
+
+