修复两位小数问题

test1.cpp

@@ -28,6 +28,6 @@ int main()
     cout << i + 1 << endl;
     for (int j = 0; j <= i; j++)
     {
-        cout << books[j].no << "\t" << books[j].name << "\t" << setprecision(2) << books[j].price << endl;
+        cout << books[j].no << "\t" << books[j].name << "\t" << fixed << setprecision(2) << books[j].price << endl;
     }
 }