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Thread: floyd triangle

  1. #1
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    Default floyd triangle

    Write a program that accepts the line number from the user and prints only that particular line from the Floyd triangle.

    Example:
    Input: 2
    Output: 2 3

    Input: 3
    Output: 4 5 6


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: floyd triangle

    Did you have any specific java programming questions? That sounds like a homework assignment. We'll help you with any java programming problems writing the program.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: floyd triangle

    no my assignment is the above given problem. i'm getting a triangle but not getting a single line which is required. pl do help

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    Default Re: floyd triangle

    Post any code you have so far and explain where in the code you need the help.
    People will be able to help you easier if they have something visual to look at .

    Wishes Ada xx
    If to Err is human - then programmers are most human of us all.
    "The Analytical Engine offers a new, a vast, and a powerful language . . .
    for the purposes of mankind
    ."
    Augusta Ada Byron, Lady Lovelace (1851)

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    Default Re: floyd triangle

    If you already have the code to print the entire triangle it should be rather trivial to limit the output to the desired line.

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    Default Re: floyd triangle

    import java.util.Scanner;

    class FloydTriangle
    {
    public static void main(String [] args)

    {
    int n, i, c;


    Scanner in = new Scanner(System.in);

    System.out.println("Enter the number of rows of Floyd's triangle to print\n");
    n = in.nextInt();

    int a=n*(n-1)/2+1;
    for (c = 1; c <= n; c++)
    {
    System.out.print(a+"");
    a++;
    }
    System.out.println("\t");
    }
    }
    i have the code.can someone explain this line (int a=n*(n-1)/2+1

  7. #7
    Super Moderator Norm's Avatar
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    Default Re: floyd triangle

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE GOES HERE
    [/code]
    to get highlighting and preserve formatting.

    explain this line (int a=n*(n-1)/2+1;
    It defines an int variable: a, evaluates an expression and assigns the value of that expression to a.
    If you don't understand my answer, don't ignore it, ask a question.

  8. The Following User Says Thank You to Norm For This Useful Post:

    divy (September 10th, 2014)

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    Default Re: floyd triangle

    whats a unit test program ?
    how t write it for the above program?

  10. #9
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    Default Re: floyd triangle

    Do you have code that compiles and executes manually and gives the desired results?
    If you don't understand my answer, don't ignore it, ask a question.

  11. #10
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    Default Re: floyd triangle

    Quote Originally Posted by Norm View Post
    Do you have code that compiles and executes manually and gives the desired results?

    n i dont have...what is that i could do now ?

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    Default Re: floyd triangle

    If you have working code that prints out all lines of the triangle all you need to do is add some sort of control that only prints the desired line. What kind of control statement do you think that would be?
    Improving the world one idiot at a time!

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