1.4.2 for语句

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书中页数：P11
代码名称：forcount.cc

    #include <iostream>
    
    int main()
    {
        int sum = 0;
    
        // sum values from 1 through 10 inclusive
        for (int val = 1; val <= 10; ++val) 
            sum += val;  // equivalent to sum = sum + val
        std::cout << "Sum of 1 to 10 inclusive is " 
                  << sum << std::endl;
        return 0;
    }