adding lecture 24

leetcode/p7_reverse_integers.cpp

@@ -0,0 +1,24 @@
+// leetcode problem 7: reverse integer
+
+class Solution {
+public:
+    int reverse(int x) {
+        int sign=1;
+        if(x<0){
+            sign = -1;
+        }
+        long result = 0;
+        x = abs(x);
+        // convert x to a string and reverse it
+        string s = to_string(x);
+        std::reverse(s.begin(),s.end());
+        try{
+            result = stoi(s);
+        }catch(const std::out_of_range& e){
+            cout<<"Error: "<<e.what()<<": out of range"<<endl;
+            return 0;
+        }
+        result = sign * result;
+        return result;
+    }
+};