Compilare: main.c: In function 'arie': main.c:14:13: warning: unused variable 'arg' [-Wunused-variable] double a,p,arg; ^~~ main.c: In function 'main': main.c:23:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf" , &N , &x , &y); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:24:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf" , &x2 , &y2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:28:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf" , &x2 , &y2); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~