Compilare: user.cpp: In function ‘int main()’: user.cpp:12:18: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(x>='a'&&x<='z'||x>='A'&&x<='Z') ^ user.cpp:9:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text.in","r",stdin); ^ user.cpp:10:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("text.out","w",stdout); ^