句子逆序

#include<iostream>
#include<string>
using namespace std;

void reverseString(string s);
string arr[100];
int k = 0;
int main(){

    string str;
    getline(cin, str);
    if(str.find(" ") == str.npos){
        cout<<str<<endl;
        return 0;
    }
    else
        reverseString(str);
    for(int i = k - 1; i >= 0; i-- )
        cout<<arr[i]<<" ";
    cout<<endl;

    return 0;
}

void reverseString(string s){
    int position = 0;
    while(1){
        int tmposition = position;
        //cout<<"tmposition = "<<tmposition<<endl;
        position = s.find(" ",tmposition);
        //cout<<"position = "<<position<<endl;
        if(position == s.npos){
            arr[k++] = s.substr(tmposition);
            //cout<<"arr[k-1] = "<<arr[k-1]<<endl;
            break;
        }
        arr[k++] = s.substr(tmposition, position - tmposition);
        //cout<<"arr[k-1] = "<<arr[k-1]<<endl;
        position++;
    }
}