Compilare: user.cpp: In function ‘int main()’: user.cpp:39:17: warning: unused variable ‘ok1’ [-Wunused-variable] int i,j,x,y,ok1,ok2,cf; ^ user.cpp:39:21: warning: unused variable ‘ok2’ [-Wunused-variable] int i,j,x,y,ok1,ok2,cf; ^ user.cpp:39:25: warning: unused variable ‘cf’ [-Wunused-variable] int i,j,x,y,ok1,ok2,cf; ^ user.cpp:40:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^