Compilare: user.c: In function ‘main’: user.c:157:21: warning: unused variable ‘next’ [-Wunused-variable] int next = i + 1; ^ user.c:156:21: warning: unused variable ‘prev’ [-Wunused-variable] int prev = i ? (i - 1) : (pointn - 1); ^ user.c:115:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triangulare.in", "r", stdin); ^ user.c:116:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("triangulare.out", "w", stdout); ^ user.c:119:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &t); ^ user.c:124:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &pointn); ^ user.c:128:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i", &pointx[i], &pointy[i]); ^