Compilare: user.cpp: In function ‘void euclid(int, int, int&, int&, int)’: user.cpp:20:19: warning: unused variable ‘d’ [-Wunused-variable] int xx,yy,d; ^ user.cpp: In function ‘int main()’: user.cpp:41:17: warning: unused variable ‘D’ [-Wunused-variable] int D,x,y; ^ user.cpp:33:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:37:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d",&a,&b,&c); ^