Compilare: user.c: In function ‘main’: user.c:35:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:37:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &a, &b); ^ user.c: In function ‘ceuler’: user.c:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:10:9: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] st[0] = x; ^ user.c:32:27: note: ‘p’ was declared here int n, i, a, b, dr = 0, p; ^