Compilare: user.cpp: In function ‘int main()’: user.cpp:58:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d %d " ,&D1.A.x,&D1.A.y,&D1.B.x,&D1.B.y); ^ user.cpp:60:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d %d " ,&D2.A.x,&D2.A.y,&D2.B.x,&D2.B.y); ^ user.cpp:62:63: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d %d " ,&D3.A.x,&D3.A.y,&D3.B.x,&D3.B.y); ^