做的不好。不要笑我。我是一个新手。- import java.util.Scanner;
- class AddTest {
- public static void main (String[] args) {
- run ();
- }
-
- private static void run () {
- System.out.println("您要进行什么运算?");
- System.out.println("1.加法\t\t2.减法\t\t3.乘法\t\t4.除法");
- Scanner sc = new Scanner(System.in);
- int z = sc.nextInt();
- switch (z) {
- case 1:
- select("加法");
- break;
- case 2:
- select("减法");
- break;
- case 3:
- select("乘法");
- break;
- case 4:
- select("除法");
- break;
- default:
- System.out.println("请选择正确的选项!");
- run();
- }
- }
- private static void select (String fh) {
- System.out.println("请选择您要进行【小数】还是【整数】的加法运算");
- System.out.println("1.整数\t\t2.小数\t\t3.返回");
- Scanner sc = new Scanner(System.in);
- String f;
- switch (fh) {
- case "加法":
- f = "加";
- break;
- case "减法":
- f = "减";
- break;
- case "乘法":
- f = "乘";
- break;
- default:
- f = "除";
- }
- int z = sc.nextInt();
- switch (z) {
- case 1:
- System.out.println("请输入"+f+"数:");
- int x = sc.nextInt();
- System.out.println("请输入被"+f+"数:");
- int y = sc.nextInt();
- selectOperation (f,x,y);
- select (fh);
- case 2:
- System.out.println("请输入"+f+"数:");
- double n = sc.nextDouble();
- System.out.println("请输入被"+f+"数:");
- double u = sc.nextDouble();
- selectOperation (f,n,u);
- select (fh);
- case 3:
- run();
- default:
- System.out.println("请选择正确的选项!");
- select (fh);
- }
- }
- //选择运算double
- private static void selectOperation (String f, double n, double u) {
- switch (f) {
- case "加":
- System.out.println(n + " + " + u + " = " + add (n, u));
- break;
- case "减":
- System.out.println(n + " - " + u + " = " + subtraction (n, u));
- break;
- case "乘":
- System.out.println(n + " * " + u + " = " + multiplication (n, u));
- break;
- default:
- System.out.println(n + " / " + u + " = " + division (n, u));
- }
- }
- //选择运算int
- private static void selectOperation (String f, int n, int u) {
- switch (f) {
- case "加":
- System.out.println(n + " + " + u + " = " + add (n, u));
- break;
- case "减":
- System.out.println(n + " - " + u + " = " + subtraction (n, u));
- break;
- case "乘":
- System.out.println(n + " * " + u + " = " + multiplication (n, u));
- break;
- default:
- System.out.println(n + " / " + u + " = " + division (n, u));
- }
- }
- //整数加法运算
- private static int add (int a, int b) {
- return a+b;
- }
- //小数加法运算
- private static double add (double a, double b) {
- return a+b;
- }
- //整数减法
- private static int subtraction (int a, int b) {
- return a-b;
- }
-
- //小数减法
- private static double subtraction (double a, double b) {
- return a-b;
- }
- //整数乘法
- private static int multiplication (int a, int b) {
- return a*b;
- }
-
- //小数乘法
- private static double multiplication (double a, double b) {
- return a*b;
- }
- //整数除法
- private static int division (int a, int b) {
- return a/b;
- }
-
- //小数除法
- private static double division (double a, double b) {
- return a/b;
- }
- }
复制代码
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