从 1 加到 55 的值

#include <iostream>
int main()
{
    int sum = 0, val = 1;
    while (val <= 10)
    {
        sum += val;
        val++;
    }
    std::cout << "从 1 加到 10 的和是 " 
        << sum <<std::endl;
    return 0;
}