two Java problems

题目

two Java problems
Question:Write a program which asks the user two numbers and the calculation (+, - , * or /) to be performed. The program shall print the calculation as well as the answer. Take care of the situation the divisor being zero.
My answer:
import java.util.Scanner;
public class task5 {
public static void main(String[] args) {
Scanner stdin=new Scanner(System.in);
System.out.println("Please enter a number ");
double a=stdin.nextDouble();
System.out.println("Please enter a number again");
double b=stdin.nextDouble();

String readEnter=stdin.nextLine();

System.out.println("Please enter a calculation(+-*/)");
String c=stdin.nextLine();

stdin.close();

String P="+", M="-", MU="*",D="/";
double result=0;

char cc=c.charAt(0);

if(cc.equals(P)){
result=a+b;
System.out.println("The result for "+a+c+b+" is "+res

答案

1、String P="+",M="-",MU="*",D="/";double result=0;char cc=c.charAt(0);if(cc.equals(P)){result=a+b;System.out.println("The result for "+a+c+b+" is "+result);}你cc是char,而P是String.所以把 char cc=c.ch...