英语计算器[java]

时间:2013-10-26 18:46:59

标签: java

创建一个将执行以下操作的java程序:

a)从键盘上读取三个输入

•两个输入数字,每个都是一个数字(0 ... 9)

•一个字符代表五个操作之一:+(加法), - (减法),*(乘法),/(除法)和^(取幂)

b)以简单的英语输出操作说明以及数字结果

import java.util.Scanner;

public class EnglishCalc {

       public static void main(String[] args)
       {
            Scanner input = new Scanner(System.in);

            System.out.println("Enter first number");
            int number1 = input.nextInt();          

            System.out.println("Enter second number");
            int number2 = input.nextInt();

            System.out.println("Enter operation: +,-,*,/,^");
            String operation = input.next();

            int output = 0;

           if(number1 < 0 || number1 > 9 || number2 < 0 || number2 > 9) {
                System.out.println("Number should be between 0 and 10");
           } 
              else if (operation.equals("+"))
           {
               output = number1 + number2;
               System.out.println("Sum of "+number1+" and "+number2+" is: " +output);
           }
               else if (operation.equals("-"))
           {
               output = number1 - number2;
               System.out.println("Subtraction of "+number2+" from "+number1+" is: " +output);
           }
               else if (operation.equals("*"))
           {   
              output = number1 * number2;
              System.out.println("Product of "+number1+" and "+number2+" is: " +output);
           }
               else if (operation.equals("/"))
           {
               if(number2 == 0) {
                   System.out.println("You cannot divide by 0");
                } else {
                output = number1/number2;
                System.out.println("Division of "+number1+" by "+number2+" is: " +output);
                }
           }
               else if(operation.equals('^'))
           {
                output = Math.pow((double)number1 , (double)number2);
                System.out.println("Value of "+num1+" raised to power of "+num2+" is: " +output);
           } else {
               System.out.println("Invalid input");
           }
    }
}

为战俘。我试过铸造不会工作。如果我不投,它不会接受int。必须加倍。

1 个答案:

答案 0 :(得分:3)

使用

s1.equals(s2)

比较字符串,而不是使用:

s1 == s2

这是因为==用于比较对象引用(如果它们是同一个对象),因此它不会比较该对象的“包含”,在本例中为String。

修改

要打印'words'中的每个数字,您可以使用数组:

String[] numbers = {"zero", "one", "two", ... };

然后将它们用作:

System.out.println(numbers[2] + " plus " + numbers[5] + ...);