Convert a selection of text from uppercase to lowercase (or vice versa).

将选择的文字从大写字母转换为小写字母（反之亦然）；

youdao

You need to convert a string from uppercase to lowercase, or vice versa.

你需要将一个字符串从大写转换为小写，或者相反。

youdao

With the exception that one of the listeners converts the input string to uppercase, while the second converts the string to lowercase, the code for the listeners is exactly the same.

例外情况，一个监听器将输入字符串转换成大写字母，而另一个将其转换成小写字母，这对于监听器所编写的代码都是完全相同的。

youdao

You can brute force it and unfortunately, the so-called Caesar cipher is not very secure because if you assume, for our purposes in English alphabet with 26 characters, say all lowercase for all uppercase, my God, you only have to try like 24, 25, 26 possible rotations until you can figure out what his secret message is.

你可以强行解密但是不幸地是，所谓的凯撒密码不是很安全的,因为如果假设，对于我们的26个字符的字母表,指明所有的小写为大写，我的天，你只要试24，25次，26次就可以解答出,密文的内容。

哈佛公开课 - 计算机科学课程节选

It's only copying the address that was returned by get string so even though conceptually is the name this program suggests, I really just want to make a copy so that maybe I can make one version of D-A-V-I-D or F-O-O all uppercase or all lowercase or I want to spell check, something.

而只是复制GetSting返回的地址,虽然这个程序表示的名称，我只想做一个拷贝,以便我可以做一个D-A-V-I-D或者F-O-O的版本,大写的或者小写的,或者拼写检查之类的。

哈佛公开课 - 计算机科学课程节选

The book rightly recommends forcing users to mix uppercase and lowercase characters, digits and punctuation characters to create more secure passwords.

FORBES: Can You Trust Your Computer?

You'll need a password of 7 to 12 characters, one uppercase, one lowercase, one number and, preferably, one character like an exclamation point or ampersand.

FORBES: Magazine Article