By 袁壮苗 2017级计算机科学与技术专业
#include <stdio.h>
#include <math.h>
int main ()
{
double x,y,j;
scanf("%lf",&x);
y=1;
j=(y+(x/y))/2;
while (fabs(y-j)>=0.000001*y)
{
y=j;
j=(y+(x/y))/2;
}
printf("%f\n",y);
}