Add nest_exception.cpp

nest_exception.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <string>
+using std::cin, std::cout, std::string;
+
+void C()
+{
+    cout << "start C\n";
+    throw -1;
+    cout << "End C\n";
+}
+void B()
+{
+    cout << "start B\n";
+    C();
+    cout << "End B\n";
+}
+
+void A()
+{
+    cout << "start A\n";
+    B();
+    cout << "End A\n";
+}
+
+int main()
+{
+    try
+    {
+        A();
+    }
+    catch (int)
+    {
+        cout << "main 处理了 int\n";
+    }
+}