Compilare: user.cpp: In function ‘punct get()’: user.cpp:33:17: warning: NULL used in arithmetic [-Wpointer-arith] while(s[j]!=NULL){ ^ user.cpp:23:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp: In function ‘int main()’: user.cpp:71:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ograzi.in","r",stdin); ^ user.cpp:72:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ograzi.out","w",stdout); ^ user.cpp:76:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d\n",&n,&m,&w,&h); ^ /tmp/cchpPyiQ.o: In function `get()': user.cpp:(.text+0x19): warning: the `gets' function is dangerous and should not be used.