无需多言，判断即可 最好不要只用用if C++代码：

N = int(input()) if N > 0: print("positive") if N < 0: print("negative") if N == 0: print("zero")

#include <iostream> using namespace std; int main(){ int n; cin>>n; if(n>0){ cout<<"positive"; }else if(n==0){//要写两个等于 cout<<"zero"; }else{ cout<<"negative"; } return 0; }

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

#include <iostream> using namespace std; int main(){ int N; cin >> N; if(N > 0) { cout<<"positive"<<endl; } if(N == 0) { cout<<"zero"<<endl; } if(N < 0) { cout<<"negative"<<endl; } return 0; }

#include<iostream> using namespace std; int main(){ int a; cin>>a; if(a>0){ cout<<"positive"; } else if(a==0){ cout<<"zero"; } else{ cout<<"negative"; } return 0; }