Random Number Won't Divide
Gibith
Posts: 18
I'm trying to work with the random number generator so I wrote some test code to try and understand it. I wanted this program to generate a random number and divide that number by 10, but when I run the program I get the same numbers as if the number wasn't divided by ten.
Here is the code:
What I ultimately need to do is get the generator to generate a number between one and ten. So if you could tell me how to do that as well I would appreciate it.
Here is the code:
import stamp.core.*;
import java.util.*;
class RandomIntTestDrive{
public static Random r1 = new Random(4);
public static Random r2 = new Random(3);
public static final int MAX_RAND = 10;
public static void main() {
System.out.println("Press 'r' to generate a random number between 1 and 10");
System.out.println(MAX_RAND);
while(true){
switch(Terminal.getChar()){
case 'r':
int test3 = r1.next();
int test4 = r2.next();
int test1 = test3 / 10;
int test2 = test4 / 10;
System.out.println(test1 + " " + test2);
System.out.println(25 / 5);
break;
}
}
}
}
What I ultimately need to do is get the generator to generate a number between one and ten. So if you could tell me how to do that as well I would appreciate it.
Comments
········System.out.println(test1·+·"·"·+·test2);
by
········· System.out.print(test1);
········· System.out.print(' ');
········· System.out.println(test2);
because I think the original line tries to create a temporary string where the values
of test1 and test2 are treated as string addresses, which they are not.
System.out has a number of print methods, each taking a different type of argument,
you can't mix types as you can in pc java.
regards peter
so next() returns a pseudorandom number from 0 to 0x7FFF
The easy way to generate numbers between 1 and 10 is
········int·test1·=·(r1.next() % 10) + 1;
········int·test2·=·(r2.next() % 10) + 1;
You then also do not need to divide by 10
To use rounded values:
········int·test1·=·((r1.next()+5) % 10) + 1;
········int·test2·=·((r2.next()+5) % 10) + 1;
regards peter