Major characters and the use of single backslash character constants, and the use of double quotes and backslash, the use of escape must be said, that is, in these characters add a backslash.

• 字符常量中使用单引号和反斜杠以及字符常量中使用双引号和反斜杠时，都必须使用转义字符表示，即在这些字符前加上反斜杠。