Question

我有一项任务，要求我根据需要将数字平方根。控制台询问我想要平方根的数字和我想要它的次数。我的代码平方根数倍，但它给出了相同的值。如何使值更接近数字的平方根？

import java.util.*;
public class SquareRootCalculator {
    public static void main(String[] args) {
    Scanner scan = new Scanner(System.in);

    int x;             // the number whose root we wish to find
    int n;             // the number of times to improve the guess

    // Read the values from the user.
    System.out.print("input a positive integer (x): ");
    x = scan.nextInt();
    System.out.print("number of times to improve the estimate: ");
    n = scan.nextInt();
    int calculation = ((x/2) + (x/(x/2)) / 2);

    for(int i = 0; i < n; i++) {
        System.out.println((double)calculation);
    }

    /*
     * The lines above read the necessary values from the user
     * and store them in the variables declared above.
     * Fill in the rest of the program below, using those
     * variables to compute and print the values mentioned
     * in the assignment.
     */

    }
}

Answer 1

将其更改为：

double calculation = x;

for(int i = 0; i < n; i++) {
    calculation = ((calculation/2) + (calculation/(calculation/2)) / 2)
    System.out.println(calculation);
}

Answer 2

而不是

int calculation = ((x/2) + (x/(x/2)) / 2);

for(int i = 0; i < n; i++) {
    System.out.println((double)calculation);
}

使用

for(int i = 0; i < n; i++) {
    x = ((x/2) + (x/(x/2)) / 2);
    System.out.println((double) x );
}

Java：使用牛顿方法多次平方根数

2 个答案: