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Thread: whats wrong?

  1. #1
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    Default whats wrong?

    public class Programme {

    there is no error for this code:

    public static void main(String[] args) {

    int count = 0;

    for (int i = 10; i < 50; i++) {
    if (isprime(i)) {
    count++;
    System.out.println(i + "is a prime number. ");

    if (count == 3) {
    break;
    }
    }
    }

    }

    public static boolean isprime(int n) {

    if (n == 1) {
    return false;
    }

    for (int i = 2; i <= n / 2; i++)
    {
    if (n % i == 0)
    {
    return false;
    }

    }
    return true;

    }
    }

    however when i put the "return true;" into an else statement like this i get an error. Why is that?
    public class Programme {

    public static void main(String[] args) {

    int count = 0;

    for (int i = 10; i < 50; i++) {
    if (isprime(i)) {
    count++;
    System.out.println(i + "is a prime number. ");

    if (count == 3) {
    break;
    }
    }
    }

    }

    public static boolean isprime(int n) {

    if (n == 1) {
    return false;
    }

    for (int i = 2; i <= n / 2; i++)
    {
    if (n % i == 0)
    {
    return false;
    }
    else
    {
    return true;
    }
    }


    }
    }

  2. #2
    Member John Joe's Avatar
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    Default Re: whats wrong?

    Please specific your problem
    Whatever you are, be a good one

  3. #3
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    Default Re: whats wrong?

    when i put
    return true after the for loop
    my program works
    for (int i = 2; i <= n / 2; i++)
    {
    if (n % i == 0)
    {
    return false;
    }

    }
    return true;

    }
    }


    but when i put return true into an else statement my program doesn't work like this

    for (int i = 2; i <= n / 2; i++)
    {
    if (n % i == 0)
    {
    return false;
    }
    else
    {
    return true;
    }
    }

  4. #4
    Member John Joe's Avatar
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    Default Re: whats wrong?

    You're missing return statement
    Whatever you are, be a good one

  5. #5
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    Default Re: whats wrong?

    what do you mean by missing? I put my return statement into an else statement

  6. #6
    Member John Joe's Avatar
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    Default Re: whats wrong?

    You need to add return statement after else brackets
    Whatever you are, be a good one

  7. #7
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    Default Re: whats wrong?

    is that a rule for java?

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