介绍两种做法： 1.数组打表

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5,INF=0x3f3f3f3f;
typedef long long LL;
int a,b;
string ans[]={"","one","two","three","four","five","six","seven","eight","nine","None"};
int main(){
	cin>>a>>b;
	if(a+b>0&&a+b<10)cout<<ans[a+b];
	else cout<<ans[10];
	return 0;
}

2.switch-case

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5,INF=0x3f3f3f3f;
typedef long long LL;
int a,b;
int main(){
	cin>>a>>b;
	switch(a+b){
		case 1:cout<<"one";break;
		case 2:cout<<"two";break;
		case 3:cout<<"three";break;
		case 4:cout<<"four";break;
		case 5:cout<<"five";break;
		case 6:cout<<"six";break;
		case 7:cout<<"seven";break;
		case 8:cout<<"eight";break;
		case 9:cout<<"nine";break;
		default:cout<<"None";break;
	}
	return 0;
}