Transfer for loop to recursion, Java

Question

I need to transfer for loop to recrusion function..

This is my fucntion:

public void AddEnemyToScreen(int enemy_count)
{
    for(int i=0 ; i<enemy_count;i++)
    {
        AddEnemey(new Enemy(r.nextInt(640), -10, textures,this,game));
    }
}

I have tried to do this:

public void AddEnemyToScreen(int enemy_count)
{
    if ( enemy_count == 1)
        AddEnemey(new Enemy(r.nextInt(640), -10, textures,this,game));
    else
    {
        AddEnemyToScreen(--enemy_count);
    }

}

but in some reason it dosent works..

Pphoenix · Accepted Answer · 2014-04-16 11:37:34Z

3

Your condition in the recursive function is to add an enemy only when enemy_count is equal to 1, meaning you will only add one enemy.

public void AddEnemyToScreen(int enemy_count)
{

    // As long as enemy count is positive, keep adding enemies.
    if ( enemy_count > 0) {
             // Add new enemy to screen
            AddEnemey(new Enemy(r.nextInt(640), -10, textures,this,game));
            AddEnemyToScreen(enemy_count-1); // Add one more            
    }

}

edited Apr 16, 2014 at 11:37

answered Apr 16, 2014 at 11:26

Pphoenix

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3 Comments

Pphoenix Over a year ago

Yes it does, it will return when enemy_count is equal to 0, since then it wont call the recursive function :)

user2922456 Over a year ago

I tried this right now..even if I send to the function count of 0 the thread addes new enemies all the time

Pphoenix Over a year ago

Sorry, my mistake. Bug fixed.

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