add exception handling

03.Advanced/ExceptionHandling.cpp

+#include <iostream>
+using namespace std;
+
+class MyException : public exception {
+
+    public:
+
+        const char * what () const throw () {
+    
+            return "C++ Exception";
+
+        }
+};
+
+int main () {
+
+    double devident, devisor;
+    string buff;
+
+    cout << "Input devident:" << endl;
+    cin >> devident;
+    getline(cin, buff);
+
+    cout << "Input devisor:" << endl;
+    cin >> devisor;
+    getline(cin, buff);
+
+    // 显式地抛出异常
+    try {
+
+        if (devisor == 0) {
+            
+            throw "Devisor can NOT be 0!";
+
+        }
+
+        cout << devident << " / " << devisor << " = " << devident/devisor << endl;
+
+    } catch (const char* msg) {
+
+        cout << msg << endl;
+
+    }
+
+    // 隐式地抛出异常
+    string s = "hello";
+    try {
+
+        char c = s.at(100);  //拋出 out_of_range 异常
+
+    } catch (out_of_range & e) {
+
+        cout << e.what() << endl;
+
+    }
+
+    // 显式地抛出自定义异常
+    try {
+    
+        throw MyException();
+
+    } catch (MyException& e) {
+
+        cout << e.what() << endl;
+
+    }
+
+}
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