#include<bits/stdc++.h> using namespace std; int main(){ int a; cin>>a; if(a==0){ cout<<"zero"; return 0; } if(a<0){ cout<<"negative"; return 0; } cout<<"positive"; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ string s; cin>>s; if(s[0]'-') cout<<"negative"; else if(s[0]'0') cout<<"zero"; else cout<<"positive"; return 0; }

关键在于条件