Compilare: user.cpp: In function ‘int main()’: user.cpp:13:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carray.in","r",stdin); ^ user.cpp:14:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carray.out","w",stdout); ^ user.cpp: In function ‘void cit(int&)’: user.cpp:107:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;Buffer[CharB]<'0'||Buffer[CharB]>'9';verf); ^ user.cpp:108:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(x=0;Buffer[CharB]>='0'&&Buffer[CharB]<='9';verf)x=x*10+Buffer[CharB]-48; ^ user.cpp: In function ‘void Cit(long long int&)’: user.cpp:112:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(;Buffer[CharB]<'0'||Buffer[CharB]>'9';verf); ^ user.cpp:113:5: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] for(x=0;Buffer[CharB]>='0'&&Buffer[CharB]<='9';verf)x=1LL*x*10+Buffer[CharB]-48; ^