Compilare: user.cpp: In function ‘void Euler(int)’: user.cpp:226: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int Get()’: user.cpp:250: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp:254: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main()’: user.cpp:261: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result