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Thread: Need help with if statement.

  1. #1
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    Default Need help with if statement.

    I want to write a program that ask the student about his favorite mathematical operations “addition or subtraction”. " I will use Scanner input in this step"

    If he write addition as an answer for the question then “ I will ask him to subtract two random numbers “.

    If he write subtraction as an answer for the question then “I will ask him to add two random numbers “.

    I wrote the program below:



    import java.util.Scanner;
    public class gradee {


    public static void main(String[] args) {

    int num1=(int)(Math.random()*100);
    int num2=(int)(Math.random()*100);


    Scanner input= new Scanner(System.in);

    //ask him whether he like to add or subtract

    System.out.print("Do you like add or subtract?");
    String like=input.next();



    if(like== "add"){
    System.out.print("What is the result of:"+num1+"-"+num2);
    int answer=input.nextInt();

    if(num1-num2==answer)
    System.out.print("That is right");
    else
    System.out.print("Try again");
    }

    else{
    System.out.print("What is the result of:"+num1+"+"+num2);
    int answer1=input.nextInt();

    if(num1+num2==answer1)
    System.out.print("That is right baby");
    else
    System.out.print("Try again");
    }

    }
    }


    The problem that I am facing is that:
    The program will execute else statement anyway:


    for example:
    This is the output when the student said he like addition.

    Do you like add or subtract?add
    What is the result of:29+13 44
    Try again
    The supposed is asking him subtraction not addition.




    Any help friends?
    Thanks in advance.


  2. #2
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    Default Re: Need help with if statement.

    Hello dreamer!
    if(like== "add")
    You should use the String's equals() method instead of the == operator when comparing Strings.

  3. #3
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    Default Re: Need help with if statement.

    Thank you so much andreas90.

    it really helped me out...

    Thanks again andreas90.

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