String length check: put excess of characters in a input box should support and make sure it is not taking that.
字符串长度检查：在输入框输入超出长度的字符串将会被允许，但要确保它不被程序通过。
First, I'm going to do a sanity check strlen so we've used string length, strlen, before.
首先，我先做一个检查，我们以前使用过字符串长度函数。
In addition to comparing the length and index values for equality, you must also check for either a null Number after parsing or an empty input string (" "or length of zero).
除了要比较长度和索引值是否相等之外，还必须检查是解析后的nullNumber还是一个空的输入字符串(或长度为0)。
When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen function.
当操作字符串并需要检验其长度是否满足某种要求时，你想当然地会使用strlen函数。
When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen function.
当操作字符串并需要检验其长度是否满足某种要求时，你想当然地会使用strlen函数。
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