Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:21: error: ‘abs’ was not declared in this scope user.cpp:35: error: ‘memcpy’ was not declared in this scope user.cpp:36: error: ‘memset’ was not declared in this scope user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result