package 第四章;

import java.io.EOFException;

//filename:App4_3.java

public class App4_3 //定义一个公共类App4_3

{

public static void main(String[] args) throws Exception

{

int a=100,b=6; //定义一个整型常量a=100,b=6

char oper; //定义一个字符型常量oper

System.out.print("请输入运算符："); //输出“请输入运算符”

oper=(char)System.in.read(); //强制类型转换

switch (oper)

{

case '+':

System.out.println(a+"+"+b+"="+(a+b));

break; //终止循环

case '-':

System.out.println(a+"-"+b+"="+(a-b));

break;

case '*':

System.out.println(a+"*"+b+"="+(a*b));

break;

case '/':

System.out.println(a+"/"+b+"="+((float)a/b));

break; //终止循环

default: //输出字符串

System.out.println("输入的符号不正确！"); //输出“输入的符号不正确！”

}

}

}