Compilare: user.c: In function ‘ultb’: user.c:5:5: warning: type of ‘x’ defaults to ‘int’ [enabled by default] int ultb(x){ ^ user.c: In function ‘main’: user.c:29:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.c:32:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &x); ^ user.c:38:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &x, &y, &z); ^