View Code of Problem 74

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main (){
	double a, x1, x2;
	scanf("%lf", &a);
	x1 = 1.0;
	x2 = (x1+a/x1)/2;
	while(fabs(x2-x1)>=1e-5){
		x1 = x2;
		x2 = (x1+a/x1)/2;
	}
	printf("%.3lf\n", x2);

	return 0;
}