Compilare: user.cpp: In function ‘void adun(long int*, long int*)’: user.cpp:4:11: warning: unused variable ‘cc’ [-Wunused-variable] {long t=0,cc,i; ^ user.cpp: In function ‘int main()’: user.cpp:12:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zero.in","r",stdin); ^ user.cpp:13:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zero.out","w",stdout); ^ user.cpp:14:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld%ld%ld%ld",&l,&b,&p,&q); ^