C++ 字符串大小写转换：将小写字母转换为大写字母

#include #include using namespace std;

int main() { string str = 'kedaoi.cn'; for (int i = 0; i < str.length(); i++) { if (str[i] >= 'a' && str[i] <= 'z') { str[i] = str[i] - 'a' + 'A'; } } cout << str << endl; return 0; }