大牛牛些。。。。。

// if.cpp -- using the if statement
#include <iostream>
int main()
{
using namespace std;
char ch;
int spaces = 0;
int total = 0;
cin.get(ch);
while (ch != '.') // quit at end of sentence
{
if (ch == ' ') // check if ch is a space
++spaces;
++total; // done every time
cin.get(ch);
}
cout << spaces << " spaces, " << total;
cout << " characters total in sentence\n";
return 0;
}
---------
不是好明白，麻烦解释下，谢谢了