Compilare: user.cpp: In function ‘int main()’: user.cpp:43:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &N, &P ); ^ user.cpp:46:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d", &P1[i].z ); ^ user.cpp:49:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf( input_file, "%d %d", &P1[i].x, &P1[i].y ); ^ user.cpp: In function ‘int what_quadrant(point)’: user.cpp:14:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int det(point, point, point)’: user.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type] } ^