Compilare: user.cpp: In function ‘int get_nr()’: user.cpp:93:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(is_digit[ch]==false){ ^ user.cpp:102:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(is_digit[ch]==true){ ^ user.cpp: In function ‘char get_char()’: user.cpp:83:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(BUF,SBUF,1,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:113:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta2.in","r",stdin); ^ user.cpp:114:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta2.out","w",stdout); ^ user.cpp:115:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^