C++ primer 练习1.9

#include<cstdlib>
#include<iostream>

int main()
{
	int value = 50;
	int sum = 0;
	while (value <= 100){
		sum += value++;
	}
	std::cout << "the sum:" << sum << std::endl;
	system("pause");
	return 0;
}

sum+=value++等价于sum=sum+value;value++;