Compilare: user.cpp: In function ‘int main()’: user.cpp:40:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[256]’ [-Wformat=] scanf ("%s\n",&s); ^ user.cpp:58:21: warning: NULL used in arithmetic [-Wpointer-arith] while(s[j]!=NULL){ ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ecuatii2.in","r",stdin); ^ user.cpp:34:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("ecuatii2.out","w",stdout); ^ user.cpp:37:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n",&n); ^ user.cpp:40:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%s\n",&s); ^