S.zip

package com.test.S; import java.util.Scanner; public class S5 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("请输入一个整数："); int num1=scanner.nextInt(); System.out.println("请输入第二个整数："); int num2=scanner.nextInt(); System.out.println("请输入您要进行的运算（1表示加法，2表示减法，3表示乘法，4表示除法）："); int operator=scanner.nextInt(); double res=0; switch (operator){ case 1: res =num1+num2; System.out.println(num1+ "+"+ num2+"="+res); break; case 2: res =num1-num2; System.out.println(num1 + "-"+ num2+"="+res); case 3: res=num1*num2; System.out.println(num1+ "*"+ num2+"="+res); break; case 4: if (num2 !=0){ res =(double) num1/ num2; System.out.println(num1+ "/"+ num2+"="+res); }else { System.out.println("除数不能为0"); } break; default: System.out.println("无效运算符"); } } }