编写程序实现从标准输入每次读入一行文本。然后改写程序，每次读入一个单词。

Write a program to read the standard input a line at a time. Modify your program to read a word at a time.

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这一行更改将允许读入百分数值，该值将决定上面显示的渐变百分数。

This one-line change will allow for reading in of the percent value that determines the shading percentage shown above.

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一旦将一行读入模式缓冲区，它就执行' d '命令，然后打印模式缓冲区的内容(在本例中没有内容)。

Once a line was read into the pattern buffer, it performed the 'd' command and printed the contents of the pattern buffer (nothing in this example).

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