Add user_defined_exception_class.cpp

user_defined_exception_class.cpp

@@ -0,0 +1,44 @@
+#include <iostream>
+#include <string>
+#include <memory>
+using std::cin, std::cout, std::string;
+
+class ArrayException
+{
+    const char *info;
+
+public:
+    ArrayException(const char *what) : info{what}
+    {
+    }
+    void print() const
+    {
+        std::cout << info << '\n';
+    }
+};
+
+class IntArray
+{
+    int data[10];
+
+public:
+    int &operator[](int index)
+    {
+        if (index < 0 || index >= 10)
+            throw ArrayException{"下标越界"};
+        return data[index];
+    }
+};
+
+int main()
+{
+    try
+    {
+        IntArray array{};
+        array[10] = 5;
+    }
+    catch (const ArrayException &exception)
+    {
+        exception.print();
+    }
+}