A310.判断正负题解：

A310.判断正负
三个if

#include<bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin >> n;

    if(n>0){
        cout << "positive";//判断>0
    }else if(n==0){//判断==0
        cout << "zero";
    }else cout << "negative";
    return 0;
}