Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:15:8: error: ‘rez’ was not declared in this scope sol*=2;rez++; ^ user.cpp:16:17: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 2 has type ‘long long unsigned int’ [-Wformat=] printf("%ld",sol); ^ user.cpp:7:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.in","r",stdin); ^ user.cpp:8:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.out","w",stdout); ^ user.cpp:9:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^