WebDec 12, 2014 · 179 6 19. Note the fastest way to do this in plain c, if you are able to assume an English ascii based system is to use (foo>='A' && foo<='Z'). That will tell you if a char is upper case. – Vality. Dec 12, 2014 at 0:37. isupper is only in the old C library, it's not in the newer string class at all! – Mooing Duck. WebJan 19, 2024 · #include void toUpperCase (std::string& str) { std::transform (str.begin (), str.end (), str.begin (), ::toupper); } int main () { std::string str = "hello"; toUpperCase (&str); std::cout << str << std::endl; // "HELLO WORLD" } Another way would be using boost provided by boost/algorithm/string.hpp.
toupper - cplusplus.com
WebAug 30, 2024 · In C++, isupper() and islower() are predefined functions used for string and character handling. cstring.h is the header file required for string functions and cctype.h … WebFeb 21, 2012 · Please define what "good enough" means. By what criteria do you plan to select the "best" answer from the answers you get here? Please also note that detecting … fisher wireless services logo
c++ - Check if character is upper case in older c-style - Stack …
WebMar 13, 2024 · 以下是 Lua 代码实现： ```lua. 以下是 Lua 代码： ```lua function convertCase(char) if char >= 'a' and char <= 'z' then return string.upper(char) elseif char >= 'A' and char <= 'Z' then return string.lower(char) else return char end end io.write("请输入一个字符：") local char = io.read(1) print("转换后的字符为：" .. convertCase(char)) ``` 这 … Web(A) A test using the isupper function will return zero if the argument is an uppercase character. (B) The isdigit function will return a nonzero value if its argument is a digit. (C) If an upper case character is passed as an argument to toupper, the result will be an upper case character. WebFunction islower () takes a single argument in the form of an integer and returns a value of type int. Even though islower () takes integer as an argument, character is passed to the function. Internally, the character is converted to its ASCII value for the check. It is defined in header file. fisher wireless headphones earbuds