support bazel complie this project and format code.

practical_exercises/10_day_practice/day9/exception/7-1.cpp

@@ -0,0 +1,34 @@
+// Eg10-9.cpp
+#include <iostream>
+using namespace std;
+class A {
+  int a;
+
+public:
+  A(int i = 0) : a(i) {}
+  ~A() { cout << "in A destructor..." << endl; }
+};
+class B {
+  A obj[3];
+  double *pb[10];
+
+public:
+  B(int k) {
+    cout << "int B constructor..." << endl;
+    for (int i = 0; i < 10; i++) {
+      pb[i] = new double[20000000];
+      if (pb[i] == 0)
+        throw i;
+      else
+        cout << "Allocated 20000000 doubles in pb[" << i << "]" << endl;
+    }
+  }
+};
+int main() {
+  try {
+    B b(2);
+  } catch (int e) {
+    cout << "catch an exception when allocated pb[" << e << "]" << endl;
+  }
+  
+}