假设英文句子由若干词构成。

int main()
{
string str="gEsP is  Interesting  !";
int x = str.length();
int nwords = 0;

for(int i = 0; i < x; i++)
 if (str[i]== ' '){
  nwords++;
  while(str[++i]== ' ') ;
 }
cout << nwords << endl;

cout << endl;
return 0;
}