[编程入门]迭代法求平方根

解题思路: 

注意事项:

参考代码:

#include<bits/stdc++.h>

using namespace std;

int main() {

double x1 , x2 , k;

cin >> k;

x1 = k / 2;

x2 = (x1 + k / x1) / 2;

while(fabs(x2 - x1) >= 0.00001){

x1 = x2;

x2 = (x1 + k / x1) / 2;

}

cout << fixed << setprecision(3) << x1 << endl;

return 0;

}