Compilare: user.cpp: In function ‘int main()’: user.cpp:155:64: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] long long n, d; scanf("%lld%lld%s%s", &n, &d, frac_a, frac_b); ^ user.cpp:93:35: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] this->a[i] -= (other.a[i] + t); ~~~~~~~~~~~~^~~~ user.cpp:91:14: note: ‘t’ was declared here int i, t; ^