C++ 字符大小写转换: 将小写字母转换为大写字母，反之亦然

#include using namespace std; int main() { char c; cin >> c; if (c >= 'a' && c <= 'z') cout << (char)(c - 'a' + 'A'); else if (c >= 'A' && c <= 'Z') cout << (char)(c - 'A' + 'a'); else cout << 'Wrong'; return 0; }