修复把0,0,0也输出的问题

test1.cpp

@@ -25,8 +25,8 @@ int main()
         }
     }
     // output
-    cout << i + 1 << endl;
-    for (int j = 0; j <= i; j++)
+    cout << i << endl;
+    for (int j = 0; j < i; j++)
     {
         cout << books[j].no << "\t" << books[j].name << "\t" << fixed << setprecision(2) << books[j].price << endl;
     }