运算符的 Java 交换机语句

Question

帮助伙计们，我正在尝试创建一个程序，让您选择 +,-,/，* 以及如何使用 switch 语句使其工作

import java.util.Scanner;
public class practice1{
public static void main (String[]Args){
Scanner input = new Scanner(System.in);
Integer num1, num2;
char op = '+', '-', '/', '*';
System.out.println("Select an operator +,-,*,/");
switch(op){
case "+":
System.out.println("Enter two numbers to add");
System.out.print("Enter first number: "); num1 = input.nextInt();
System.out.print("Enter second number: "); num2 = input.nextInt();
System.out.println(num1 + num2);
break;

}
}
}

Answer 1

试试这个：

package com.sujit;
import java.util.Scanner;
public class UserInput {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
boolean flag = true;
do {
System.out.println("Enter 1st number");
int num1 = input.nextInt();
System.out.println("Enter 2nd number");
int num2 = input.nextInt();
System.out.println("select one operator :n 1)+n2)-n3)*n4)/n5)Exit(Enter E)n");
System.out.println("Enter your choice :");
char choice = input.next().charAt(0);
String ch = String.valueOf(choice);
switch (ch) {
case "+":   
System.out.println("Addition = "+(num1+num2));
break;
case "-":   
System.out.println("Subtraction = "+(num1-num2));
break;
case "*":   
System.out.println("Multiplication = "+(num1*num2));
break;
case "/":   
if(num2==0){
System.out.println("Cant devide by 0");
flag=false;
}
else {
System.out.println("Division = "+(num1/num2));
}
break;
case "E":   
input.close();
flag=false;
break;
default:
System.out.println("Wrong choice");
break;
}
}       
while(flag);
}
}