问题描述
您好b $ b 我希望找到一种方法，无论使用哪个字母，都可以将任何小写字母更改为大写字母。我在网上看到了一些关于使用asciii值来完成这个的事情，但是我不确定这将如何应用于每个字母。 我相信这会将小写字母b转换为大写字母B，但我怎么能把这个改成 到适用于任何信件？ 'B'='b' - 'a'+'A' 我非常感谢您提供的任何建议或帮助。
Hi I'm hoping to find a way to change any lowercase letter to an uppercase no matter which letter is used. I saw online something about using the asciii values to accomplish this however I'm not sure how this would be applied to every letter. This I believe will convert lowercase b to uppercase B, but how could I change this to apply to any letter? ‘B’ = ‘b’ – ‘a’ + ‘A’ I greatly appreciate any advice or help you may offer.
推荐答案
安全的做法是： The safe way is to do something like:
char c = ...;
if (islower(c)) c=toupper(c);或
or
wchar_t c = ...;
if (iswlower(c)) c=towupper(c); 另请参阅 http://www.cplusplus.com/reference/cctype/ islower / [ ^ ] char 基于文本，或 http://www.cplusplus.com/reference / cwctype / iswlower / [ ^ ]对于 wchar_t 基于文本。 干杯 Andi
See also http://www.cplusplus.com/reference/cctype/islower/[^] for char based text, or http://www.cplusplus.com/reference/cwctype/iswlower/[^] for wchar_t based text.
Cheers
Andi
之间的区别A（65）和a（97）的ASCII值为32.这对所有字母都是相同的。您可以简单地从小写值中减去32，这将是大写等效。 The difference between the ASCII value for A (65) and a (97) is 32. This is the same for all letters. You can simply subtract 32 from the lower case value and that would be the upper case equivalent.
您可以使用这些函数 [ ^ ]或这些 [