#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
    float x1=1,x2,t;
    int a;
    printf("请输入求平方根的值：");
    scanf("%d",&a);
    while(fabs(x2-x1)>1e-5)
    {
                  x2=0.5*(x1+a/x1);
                  t=x1;
                  x1=x2;
                  x2=t;       
                           }
                           printf("利用迭代法求得%d的平方根是：%4.4f",a,x1);
                           system("PAUSE");
                           return 0;
}