Greenfoot

Codec

2020/9/2

#

Random Numbers. I am a bit confused of how to code "get a random number between -45 and 45".

danpost

2020/9/2

#

Codec wrote...

Random Numbers. I am a bit confused of how to code "get a random number between -45 and 45".

Minimum value: -45 (starting value). Range: 91 (randomly picked). Hope that helps.

RcCookie

2020/9/2

#

If you want to get a random number, you can use

double x = Math.random();

This returns a random number between 0(inclusive) and 1(exclusive). If you want a number in a specific range, you can multiply the number by the maximum value:

double x = Math.random() * 90;

Here 90 is the max value(exclusive) To get an integer value, just write

int x = (int)(Math.random() * 90);

To get a value between -45 and 45(inclusive), you can do this:

int x = (int)(Math.random() * 91) - 45;

danpost

2020/9/3

#

RcCookie wrote...

To get an integer value, just write

int x = (int)(Math.random() * 90);

To get a value between -45 and 45(inclusive), you can do this:

int x = (int)(Math.random() * 91) - 45;

Greenfoot provides a method to get a random int value back:

int x = Greenfoot.getRandomNumber(91)-45;

This is the standard way to do in greenfoot.

RcCookie

2020/9/3

#

Actually didn’t know that

Codec

2020/9/7

#

Thanks guys it worked.

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