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Thread: The operator / is undefined for the argument type(s)

  1. #1
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    Default The operator / is undefined for the argument type(s)

    Question (school):
    Write a program that prompts for two numbers, then divides the first by the second. Write the answer in the form "<a> divided by <b> is <answer>."

    My Code:
    import java.io.*;  //this needs to be at the top of your program, right below the “packages”
    /**
       * @author: My Name
       * @date: 2013-09-27
       * @filename: ICS3UMyNameJavaAssignment2d.java
       * @description: Asks the user for 2 numbers than divides the first number by the second.
       */
    public class ICS3UMyNameJavaAssignment2d
    {
      public static void main (String[] args) throws Exception {
        {
          BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));
          String f; //creates a string variable to get first number from user
          double first = 0.0; //double first needed later
          System.out.print("Enter the first number: ");  //gets first number from user
          f = buffer.readLine(); //reads a line from the console
          first = Double.parseDouble(f);//gets the double value from string variable f
          System.out.println(f + " will be divided by: "); //states string variable f
     
          String s; //creates a string variable to get time (travelled) from user
          double second = 0.0; //double second
          System.out.print("Enter the second number: "); //gets the second number from user
          s = buffer.readLine(); //reads a line from the console
          second = Double.parseDouble(s);//gets the double value from string variable s
          System.out.println("The quotient of " + f + " and " + s + " is " + f/s); //output
        }
      }
    }

    Error:
    1 error found:
    [B]Error: The operator / is undefined for the argument type(s) java.lang.String, java.lang.String[/B]


  2. #2
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    Default Re: The operator / is undefined for the argument type(s)

    Place 'f/s' in parentheses, ( f / s ).

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    Default Re: The operator / is undefined for the argument type(s)

    Error:
    Error: The operator / is undefined for the argument type(s) java.lang.String, java.lang.String

    Is the new error after adding that.

    System.out.println("The quotient of " + f + " and " + s +  " is " + (f / s)); //output


    EDIT:
    I solved it I was using the strings to divide the quotient I had to use the double (first and second not f and s)

    import java.io.*;  //this needs to be at the top of your program, right below the “packages”
    /**
       * @author: My Name
       * @date: 2013-09-27
       * @filename: ICS3UMyNameJavaAssignment2d.java
       * @description: Asks the user for 2 numbers than divides the first number by the second.
       */
    public class ICS3UMyNameJavaAssignment2d
    {
      public static void main (String[] args) throws Exception {
        {
          BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));
          String f; //creates a string variable to get first number from user
          double first = 0.0; //double first needed later
          System.out.print("Enter the first number: ");  //gets first number from user
          f = buffer.readLine(); //reads a line from the console
          first = Double.parseDouble(f);//gets the double value from string variable f
          System.out.println(f + " will be divided by: "); //states string variable f
     
          String s; //creates a string variable to get time (travelled) from user
          double second = 0.0; //double second
          System.out.print("Enter the second number: "); //gets the second number from user
          s = buffer.readLine(); //reads a line from the console
          second = Double.parseDouble(s);//gets the double value from string variable 
          System.out.println("The quotient of " + f + " and " + s +  " is " + (first / second)); //output
        }
      }
    }

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    Default Re: The operator / is undefined for the argument type(s)

    Oh! 'S'cuse me! I assumed that 'f' and 's' were numerical variables. Why aren't they? I think you mean to use 'first' and 'second' rather than 'f' and 's'.

  5. The Following User Says Thank You to GregBrannon For This Useful Post:

    boyjam2 (September 28th, 2013)

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    Default Re: The operator / is undefined for the argument type(s)

    Yes I did, thanks!

    You can close this thread and mark it as solved.
    Thanks for the help, much appreciated.

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    Default Re: The operator / is undefined for the argument type(s)

    I can't, but I think you can. You're welcome.

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    Default Re: The operator / is undefined for the argument type(s)

    Quote Originally Posted by GregBrannon View Post
    I can't, but I think you can. You're welcome.
    Just looked at the next question and it says I need to display the answer I get from the question above (the one you helped me answer) as a % so basically for the code above if I did first number 25 and second number 5 I need to show the answer (5) as a % which I have no idea how to do.

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    Default Re: The operator / is undefined for the argument type(s)

    A quotient is multiplied by 100 to give the 'percent'. For 25/5, the result '5' is "500 percent." For another example with a quotient less than 1, let's say 5 / 25 = 0.2, multiplying by 100 gives the "percent" answer as "20 percent."

    Hope that helps explain it.

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