Compilare: user.c: In function ‘main’: user.c:25:21: warning: unused variable ‘size’ [-Wunused-variable] int i, j, k, val, size; ^ user.c:29:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &N, &D); ^ user.c:31:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &val); ^ user.c:63:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("produse.out", "w", stdout); ^