Hi,

If number is divisible by 2 then its even number.

Suppose you have a variable i then you can use following code for finding if the number is even:

if(i%2==0 ){
//Number is even
}

You can use the for loop and print all the numbers between 1 and 100

for (int i=1;i <=num ; i++){
  if(i%2==0 ){
  System.out.print(i+",");
  }

Check complete example at Write a program to list all even numbers between two numbers.

Thanks