Java欧拉函数的计算代码详解

package com.qlu.java1;

import java.util.Scanner;

/**
 * 1.欧拉函数求解
 *
 * @author Dxkstart
 * @create 2021-05-28 13:32
 */
public class EulerTest {
    public static void main(String[] args) {
        Euler e = new Euler();
        e.euler();
    }
}

class Euler {
    int num;//最大公因数
    int eul;//欧拉函数值

    //求gcd
    public int gcd(int m, int b) {

        for (int i = (m - 1); i > 0; i--) {
            if (m % i == 0 && b % i == 0) {
                num = i;
                break;
            }
        }
        return num;
    }

    //求欧拉函数
    public void euler() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要求的欧拉函数：");
        int m = scanner.nextInt();

        for (int j = 1; j < m; j++) {
            if (gcd(m, j) == 1) {
                eul++;
            }
        }

        System.out.println("欧拉函数值为：" + eul);
    }
}