Eroare de compilare: user.c: In function ‘binexp’: user.c:70:14: error: ‘C’ undeclared (first use in this function) return x % C; ^ user.c:70:14: note: each undeclared identifier is reported only once for each function it appears in user.c: In function ‘sumdiv’: user.c:107:15: error: ‘C’ undeclared (first use in this function) s = ((s % C) + (binexp(d, j) % C)) % C; ^ user.c: In function ‘main’: user.c:20:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%llu%*c%llu%*c", &a, &b); ^ user.c: In function ‘invers_mod’: user.c:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^