Compilare: user.cpp: In function ‘int main()’: user.cpp:57:6: warning: unused variable ‘g’ [-Wunused-variable] FILE*g=freopen("alee.out","w",stdout); ^ user.cpp:24:26: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {fread(buff,1,2200,stdin); ^ user.cpp: In function ‘void read(int&)’: user.cpp:14:101: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos] < '0' || buff[pos] > '9') if(++pos == 2200) fread(buff, 1, 2200, stdin), pos = 0; ^ user.cpp:19:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == 2200) fread(buff, 1, 2200, stdin), pos = 0; ^