1.4.1 while语句

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书中页数：P10
代码名称：whilecount.cc

    #include <iostream>
    
    int main()
    {
        int sum = 0, val = 1;
        // keep executing the while as long as val is less than or equal to 10
        while (val <= 10) {
            sum += val;  // assigns sum + val to sum
            ++val;       // add 1 to val
        }
        std::cout << "Sum of 1 to 10 inclusive is " 
                  << sum << std::endl;
    
    	return 0;
    }