提醒一下新手，int表达式的值可以强转bool值

#include<bits/stdc++.h>
using namespace std;
int b;
int main(){
	cin>>b;
	if(b%2)cout<<"odd";
	else cout<<"even";
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a%2==0) cout<<"even";
	else cout<<"odd";
	return 0;
}