while

#include <iostream>

using namespace std;
int main()
{ //计算s=1+2+3...+100
int s = 0, n = 1;
while (n <= 100)
{
s += n;
n++;
}
cout << "s=" << s << endl;

//累加键盘输入的数据
double x, sum = 0.0;
cout << "x=";
cin >> x;
while (x != 0) {
	sum += x;
	cout << "x=";
	cin >> x;
}
cout << "sum=" << sum << endl;
return 0;

}