使用STL进行字数统计

Question

如何使用STL算法从指定位置计算段落中的单词数？

Answer 1

#include <algorithm>
#include <cctype>    
#include <functional>
#include <string> 


inline unsigned CountWords( const std::string& s )        
{    
std::string x = s;
std::replace_if( x.begin(), x.end(), std::ptr_fun <int, int> ( std::isspace ), ' ' );
x.erase( 0, x.find_first_not_of( " " ) );
if (x.empty()) return 0;
return std::count( x.begin(), std::unique( x.begin(), x.end() ), ' ' ) + !std::isspace(           *s.regin() );         
}  

Answer 2

int count_words(const char *input_buf) {
    stringstream ss;
    ss << input_buf;
    string word;
    int words = 0;
    while(ss >> word) words++;
    return words;
}