Compilare: user.cpp: In function ‘int main()’: user.cpp:36:60: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld%lld", &a.x1, &a.y1, &a.x2, &a.y2); ^ user.cpp:37:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld%lld", &b.x1, &b.y1, &b.x2, &b.y2); ^ user.cpp:38:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld%lld", &c.x1, &c.y1, &c.x2, &c.y2); ^