How Can I complete this question to get how many words the user entered ?

#include #include using namespace std;

int main() { string str; int pos, words;

..... // end of variable declaration cout<< " please enter a Sentence: "<

pos = str.find(' ', pos+1);

if (pos>0) { ...........

words++; } else empty=true; //End If while(pos>=0 && !empty) { ........ .........

} //End While

cout << " This Sentence has " << words << " words"<

}