Compilare: main.c: In function 'main': main.c:11:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^~~~~~~~~~~~~~~~~~~~~ main.c:12:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x1, &y1); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] { fscanf(fin, "%d%d", &x2, &y2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~