Compilare: main.c: In function 'main': main.c:28:20: warning: implicit declaration of function 'echilateral' [-Wimplicit-function-declaration] if(echilateral(points[i], points[j], points[k])) ^~~~~~~~~~~ main.c:22:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&N); ^~~~~~~~~~~~~~~~~~~ main.c:24:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lf %lf", &(points[i].x), &(points[i].y) ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~