Note: To extract characters from the end of the string, use a negative start number.
注意:要从字符的尾部开始取字符,用负数做为起始字符。
For example, you can convert the string "1234" to a number.
例如,您可以将“1234”字串转换为一个数字。
And it boils down to modifying the format string with just a simple number.
它归结于是用一个简单的数字来,修改字符串的格式。
Some types of conversions, such as from a string to a number, are time-consuming.
有些转换类型十分耗费时间,例如从字串转换为数字。
Note: To extract characters from the end of the string, use a negative start number.
注意:要从字符的末尾开始选取字符,用一个负的起始值。
Note: To extract characters from the end of the string, use a negative start number.
注意:要从字符的末尾开始选取字符,用一个负的起始值。
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