迭代法求平方根

参考代码:

#include<stdio.h>

#include<math.h>

int main()

{

int a;

float x1,x2=1.0;

scanf("%d",&a);

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

{

x1 = x2;

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

}

printf("%.3f",x2);

    return 0;

}