As shown in Figure 4, you get a blank screen, a horizontal rule, and a return value of 1.

您得到的是一个空白的屏幕，一条水平线和返回值1，如图4所示。

youdao

As shown in Figure 4, you get a blank screen, a horizontal rule, and a return value of 1.

您得到的是一个空白的屏幕，一条水平线和返回值1，如图4所示。

youdao