Kind of cheated using an array, but it's cleaner:

// Write your code here
    if (n > 9) {
        std::cout << "Greater than 9";
    }
    else if (n >= 1){
        std::string numbers[9] = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
        std::cout << numbers[--n];
    }
    return 0;

// Write your code here if(n==1) { cout<<"one"<

return 0;

}

int main() { string n_temp; getline(cin, n_temp);

int n = stoi(ltrim(rtrim(n_temp)));

// Write your code here
if(n==1)
{
    cout<<"one"<<endl;
}
else if (n==2) {
cout<<"tow"<<endl;
}
else if (n==3) {
cout<<"three"<<endl;
}
else if (n==4) {
cout<<"four"<<endl;
}
else if (n==5) {
cout<<"five"<<endl;
}
else if (n==6) {
cout<<"six"<<endl;
}
else if (n==7) {
cout<<"seven"<<endl;
}
else if (n==8) {
cout<<"eight"<<endl;
}
else{
    cout<<"Greater than 9"<<endl;
}


return 0;

}

if (n == 5){ cout << "five" << endl; } else if(n == 8){ cout << "eight" << endl; } else if(n > 9){ cout << "Greater than 9" << endl; } else{ cout << "error" << endl; }

// Write your code here n==1?cout<<"one":n==2?cout<<"two":n==3?cout<<"three":n==4?cout<<"four":n==5?cout<<"five":n==6?cout<<"six":n==7?cout<<"seven":n==8?cout<<"eight":n==9?cout<<"nine":cout<<"Greater than 9";