I want to print random numbers from -100 to 100

Question

I want to print 10 random numbers from -100 to 100, but my code below always print negitive number. I did not get any answer for this. How to do this ?

import java.util.Random;
public class VectorAndList {
public static void main(String arg[]){
    Random random = new Random();
    int number ;
    for(int i=0;i<10;i++)
    System.out.println(number = random.nextInt(100)+ (-100)) ;
}
}

score 1 · Accepted Answer · answered Nov 12 '16 at 07:46

1

Problem is you calculate random number between 100 then you minus(100) that values thats why you received values negative only.

so change like this

Random random = new Random();
int number ;
for(int i=0;i<10;i++)
System.out.println(number = random.nextInt(201)-100) ;

answered Nov 12 '16 at 07:46

sasikumar

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This will print only the positive numbers, range is -100 to 100 – Saravana Nov 12 '16 at 07:50
no ..based on possibility it gives negative ..example random number is 5 means 5-100 so result would be -95 – sasikumar Nov 12 '16 at 07:52
yes, correct, it will – Saravana Nov 12 '16 at 07:53

Saravana · Answer 2 · 2016-11-12T07:56:05.513

1

Generate number from 0-100 and flip the sign randomly

Random rand = new Random();
int no = rand.nextBoolean() ? rand.nextInt(100) : rand.nextInt(100) * -1;
System.out.println(no);

alternatively you can use ThreadLocalRandom with negative range as well

ThreadLocalRandom random = ThreadLocalRandom.current();
for (int i = 0; i < 10; i++) {
    int no = random.nextInt(-100, 100);
    System.out.println(no);
}

edited Nov 12 '16 at 07:56

answered Nov 12 '16 at 07:50

Saravana

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I want to print random numbers from -100 to 100

2 Answers2