Compilare: user.cpp: In function ‘void update(char*)’: user.cpp:26:16: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z') ^ user.cpp: In function ‘int main()’: user.cpp:54:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(InFile, "r", stdin); ^ user.cpp:55:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OuFile, "w", stdout); ^