P63 计算一个正数的平方根

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
int main()
{
int n = 0;
scanf("%d", &n);
float a1 = 1;
float temp = 0;
float a2 = 0;
int i = 0;
for (i = 1;a1 != a2; i++)
{
a2 = (a1 + n / a1) / 2;
temp = a2;
a2 = a1;
a1 = temp;
}
printf("a1 = %f\n", a1);
system("pause");
return 0;
}