Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:80:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=1; ^~ user.cpp: In function ‘void read()’: user.cpp:14:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^