bool wordStart = false;

vector<string> v;

const char *pHead =s.c_str();

const char *pStr, *pBegin, *pEnd;

for (pStr=pHead; *pStr!='\0'; pStr++) {

if (!isspace(*pStr) && wordStart == false){

wordStart = true;

pBegin = pStr;

continue;

}

if(isspace(*pStr) && wordStart==true){

wordStart=false;

pEnd = pStr;

v.insert(v.begin(), s.substr(pBegin-pHead, pEnd-pBegin) );

}

}

if (wordStart==true){

pEnd = pStr;

v.insert(v.begin(), s.substr(pBegin-pHead, pEnd-pBegin) );

}

if (v.size()>0){

s.clear();

char space=' ';

vector<string>::iterator it;

for (it=v.begin(); it!=v.end(); ++it) {

s = s + *it;

s.push_back(space);

}

s.erase(s.end()-1);

}else{

s.clear();

}

cout << "[" << s << "]" <<endl;

{

string s;

reverseWords(s);

s=" ";

reverseWords(s);

s="1 ";

reverseWords(s);

s="love";

reverseWords(s);

s="i love cpp";

reverseWords(s);