Compilare: user.cpp: In function ‘int main()’: user.cpp:109:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (s[1] == 'M') ^ user.cpp:99:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0; ^ user.cpp:93:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("zeap.in", "r", stdin); ^ user.cpp:94:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("zeap.out", "w", stdout); ^ /tmp/cco6zXLF.o: In function `main': user.cpp:(.text.startup+0xc0): warning: the `gets' function is dangerous and should not be used.