Compilare: user.cpp: In function ‘int main()’: user.cpp:67:19: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(f1.b-f2.b >= -0.000001 && f1.b-f2.b <= 0.000001 ) ^ user.cpp:41:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin); ^ user.cpp:42:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.out","w",stdout); ^ user.cpp:47:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:49:95: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf",&sgm[i].start.x,&sgm[i].start.y,&sgm[i].stop.x,&sgm[i].stop.y); ^