Practical Coding in Java

//
// Sequences.java
//


public class Sequences
{
    public static void main(String[] args)
    {
        System.out.println("Sequences");
        System.out.println();

        // print multiples of 7

        for (int i=0; i<30; i++)
        {
            if (i%7 == 0)
                System.out.println(i);
        }

        System.out.println();

        // Note:
        //   =  is variable assignment
        //   == is equality comparison

        // Note:
        // i += 7 means:  i = i+7
        // i++ means:  i+=1 (or i=i+1)

        // print multiples of 7 again

        for (int i=0; i<30; i+=7)
            System.out.println(i);

        System.out.println();

        // arithmetic sequence:
        // 3, 10, 17, 24, ...

        // print sequence using explicit formula
        
        for (int i=0; i<5; i++)
            System.out.println(i*7 + 3);

        System.out.println();

        // print sequence using recursive formula

        int value = 3;

        for (int i=0; i<5; i++)
        {
            System.out.println(value);
            value += 7;
        }

        System.out.println();
    }
}