2017-06-28

package Java.Test;

import java.util.Scanner;

public class Counter {

public static void main(String[] args) {
Scanner scan=new Scanner(System.in); //
System.out.println("请输入变量a的值");
int a=scan.nextInt();
System.out.println("请输入运算符号");
String c=scan.next();
System.out.println("请输入变量b的值");
double b=scan.nextDouble();
if("+".equals(c)){ //引用数据类型之间的比较
double sum=(double)a+b;
System.out.println("a+b="+sum);
}
else if("-".equals(c)){
double sum=(double)a-b;
System.out.println("a-b="+sum);
}
else if("*".equals(c)){
double sum=(double)a*b;
System.out.println("a*b="+sum);
}
else if("/".equals(c)){
double sum=(double)a/b;
System.out.println("a/b="+sum);
}
}
}

熟练使用equals在比较和运算中的应用，复习scanner的用法