Sample 6.1：if.cpp

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#include<iostream>
int main()
{
    using namespace std;
    char ch;
    int spaces = 0;
    int total = 0;
    cin.get(ch);
    while(ch != '.')
    {
        if(ch == ' ')
            ++spaces;
        ++total;
        cin.get(ch);
    }
    cout << spaces << " spaces, " << total;
    cout << " characters total in sentence\n";
    return 0;
}