迭代算法求平方根

#include<stdio.h>
#include<math.h>
void main()
{ 
    double a,x0,x1; 
    printf("input a:\n");   
    scanf("%lf",&a);   
    if(a<0)printf("ERROR!\n");  
    else
    { 
        x0=a/2;
        x1=(x0+a/x0)/2;      
        do
        { 
            x0=x1;
            x1=(x0+a/x0)/2;
        }while(fabs(x0-x1)>=1e-6);
    }   
     printf("Result:\n");    printf("sqrt(%g)=%g\n",a,x1);
}

运行结果如下：

转载于:https://blog.51cto.com/10602803/1683035