bnvcbv.cpp

DV高级语言程序设计

#include<iostream.h>
void main()
{
	double c,b,a;
	cout<<"input a positive:";
	cin>>c;
	if(c<=0)
		cout<<"error!xmust apositive;";
	else
	{
		double a=1.0;
	     b=0.5*(a+(c/a));
			while((a>b?a-b:b-a)>1.0e-5)
			{
			b=a;
			a=0.5*(b+(c/b));
			}
			cout<<b;
	}
}