import java.util.Scanner;
class CalCulateTest
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
System.out.println("请输入一个数字:");
double num1=sc.nextDouble();
// nextLine()是重点,非常重要
sc.nextLine();
System.out.println("请选择操作符:");
System.out.println("1.+\t2.-");
System.out.println("3.*\t4./");
System.out.println("=============");
//char op;//用来保存用户输入的操作符的
//trim()去掉空格
//op=sc.nextLine().trim().charAt(0);
//char op1;
//op1=sc.nextLine().trim().charAt(0);
//int op;
double op;
op=sc.nextDouble();
sc.nextLine();
System.out.println("请输入第二个数:");
double num2=sc.nextDouble();
if(op==1)
{
System.out.println(num1+"+"+num2+"="+(num1+num2));
}
if(op==2)
{
System.out.println(num1+"-"+num2+"="+(num1-num2));
}
if(op==3)
{
System.out.println(num1+"*"+num2+"="+(num1*num2));
}
if(op==4)
{
System.out.println(num1+"/"+num2+"="+(num1/num2));
}
}
}
class CalCulateTest
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
System.out.println("请输入一个数字:");
double num1=sc.nextDouble();
// nextLine()是重点,非常重要
sc.nextLine();
System.out.println("请选择操作符:");
System.out.println("1.+\t2.-");
System.out.println("3.*\t4./");
System.out.println("=============");
//char op;//用来保存用户输入的操作符的
//trim()去掉空格
//op=sc.nextLine().trim().charAt(0);
//char op1;
//op1=sc.nextLine().trim().charAt(0);
//int op;
double op;
op=sc.nextDouble();
sc.nextLine();
System.out.println("请输入第二个数:");
double num2=sc.nextDouble();
if(op==1)
{
System.out.println(num1+"+"+num2+"="+(num1+num2));
}
if(op==2)
{
System.out.println(num1+"-"+num2+"="+(num1-num2));
}
if(op==3)
{
System.out.println(num1+"*"+num2+"="+(num1*num2));
}
if(op==4)
{
System.out.println(num1+"/"+num2+"="+(num1/num2));
}
}
}