For loop question : In C++

For loop question
Solution : First uncomment the line and try to figure out the error in the compiler.
Code :
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int a, b, n;
    cin>>a;
    //cout<<endl;
    cin>>b;
    for(int n=a;n<=b;n++){
    if(n>=1&&n<=9){
        if(n==1)
            cout<<"one";
        else if(n==2)
            cout<<"two";
        else if(n==3)
            cout<<"three";
        else if(n==4)
            cout<<"four";
        else if(n==4)
            cout<<"four";
        else if(n==5)
            cout<<"five";
           
        else if(n==6)
            cout<<"six";
        else if(n==7)
            cout<<"seven";
        else if(n==8)
            cout<<"eight";
        else if(n==9)
            cout<<"nine";        
    }
     else
        if(n%2==0)
            cout<<"even";
        else
            cout<<"odd";
    cout<<"\n";
    }
   
    return 0;
}