How to find multiples of 3 and 5 in an array java

Question

I'm trying to write a code that finds the multiples of 3 and 5 in an array of numbers 1 to 100, the code I have generates the numbers I want but it gives me the multiples of 3, then gives me the multiples of 5 (Example: 3 6 9 12 15,5 10 15) I want them all together (Example 3 5 6 9 10 12 15).

here is the code I have so far

for(int i = 0 ; i < 100; i=i+3){
      if(i%3 == 0)
       System.out.println(i);
       }
    for (int i=1; i < 100; i++) {
            if (i%5==0) System.out.println(i);}

I also tried

if(i%3 == 0 && i%5==0)

but that only gave me the numbers divisible by both

an explanation after would be helpful thank you

You should use OR logic not AND...you want the number to print if it is divisible by 3 **OR** it is divisible by 5 — brso05, Mar 08 '18 at 19:10

score 4 · Answer 1 · answered Mar 08 '18 at 19:10

4

You want numbers that are divisible by 3 OR divisible by 5. Therefore you should use || (OR) instead of && (AND):

for (int i = 0 ; i < 100; i++) {
    if(i%3 == 0 || i%5==0) {
        System.out.println(i);
    }
}

answered Mar 08 '18 at 19:10

Eran

387,369
54
702
768

score 1 · Answer 2 · answered Mar 08 '18 at 19:17

You can try the following to get 3,5,6,9,10,12,15..

for(int i = 0 ; i < 100; i++) { //Loop from 0 to 100
      if(i % 3 == 0 || i % 5 == 0 ) //check the number is divisible by 3 or 5
       System.out.println(i); //print the number if it is divisible by 3 or 5
}

score 0 · Answer 3 · answered Mar 08 '18 at 19:11

0

 for(int i=1;i<=100;i++){
    if(i%3==0||i%5==0)
        System.out.println(i)
    }

The above code give you the number which can be divided either by 3 or 5

answered Mar 08 '18 at 19:11

buqing

925
8
25

score 0 · Answer 4 · edited Mar 08 '18 at 20:07

0

public class Multiple {

    public static void main(String[] args) {
        int i;
        for (i = 0; i <= 100; i++) {
            if (i % 3 == 0 || i % 5 == 0) {
                System.out.println(i);
            }
        }
    }

}

edited Mar 08 '18 at 20:07

bedrin

4,458
32
53

answered Mar 08 '18 at 19:13

Chetan J Rao

905
9
14

score 0 · Answer 5 · answered Mar 08 '18 at 19:23

Didn't put too much time into this but what about just using a variable so it doesn't repeat:

public class main {
    public static void main(String[] args) {
        boolean printed = false;
        for(int i = 0 ; i < 100; i++){
            printed = false;
              if(i%3 == 0 && printed == false){
               System.out.println(i);
               printed = true;
              }
              if (i%5==0 && printed == false) System.out.println(i);}   
     }
}

How to find multiples of 3 and 5 in an array java

5 Answers5