牛顿逼近法求平方根

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

int main() {
    double n, x, last;
    printf("plz input the num:\n");
    scanf("%lf", &n);
    printf("%g\n", n);
    x = n; // 猜测初始值
    do {
        last = x;
        x = (x + n / x) / 2;
    } while (fabs(last - x) > 1e-5);
    printf("%g\n", last);
    return 0;
}