Compilare: user.c: In function ‘disp_ship’: user.c:19:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if ( a[i][0] < x && a[i][1] > x ) ^ user.c: In function ‘main’: user.c:50:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%ld", &n); ^ user.c:51:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%ld", &m); ^ user.c:56:12: warning: ignoring return value of ‘realloc’, declared with attribute warn_unused_result [-Wunused-result] realloc (a, (nr + 100) * sizeof(long int[3]) ); ^ user.c:58:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &c); ^ user.c:61:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%ld%ld%ld", &x, &y, &z); ^ user.c:67:12: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f, "%ld", &x); ^