Compilare: user.cpp: In function ‘int nr_cifre(int)’: user.cpp:17:10: warning: statement has no effect [-Wunused-value] for(x; x>0; x /= 10) ^ user.cpp: In function ‘void read()’: user.cpp:11:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &a,&b,&c,&k); ^ user.cpp: In function ‘int main()’: user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre.in", "r", stdin); ^ user.cpp:31:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cifre.out", "w", stdout); ^