java代码实例 使用switch实现简易的计算器（实现加减乘除)

import java.util.Scanner;

/*
* 使用switch实现简易的计算器（实现加减乘除);
*/
public class test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("输入一个表达式(例如： 5 + 3)：");
int a = sc.nextInt();
char ch = sc.next().charAt(0);
int b = sc.nextInt();
switch (ch) {
case '+':
jia(a, b);
break;
case '-':
jian(a, b);
break;
case '*':
cheng(a, b);
break;
case '/':
chu(a, b);
break;
default:
System.out.println("输入错误");
break;
}
}

private static void cheng(int a, int b) {
int sum = a * b;
System.out.println("两数积：" + sum);
}

private static void jian(int a, int b) {
int sum = a - b;
System.out.println("两数差：" + sum);
}

private static void chu(int a, int b) {
if (b == 0) {
System.out.println("除数不能为零~");
} else {
int sum = a / b;
System.out.println("两数商：" + sum);
}
}
private static void jia(int a, int b) {
int sum = a + b;
System.out.println("两数和：" + sum);
}
}