1	// Example 2.2 joi/examples/While2Demo.java
     2	//
     3	//
     4	// Copyright 2003 Bill Campbell and Ethan Bolker
     5	
     6	// A class for illustrating the while-statement.  A typical run:
     7	// 
     8	// %> java While2Demo
     9	// Enter integer: 10
    10	// Fibonacci numbers <= 10: 1 1 2 3 5 8
    11	// Fibonacci numbers <= 10: 1 1 2 3 5 8
    12	// First 10 Fibonacci numbers: 1 1 2 3 5 8 13 21 34 55
    13	
    14	public class While2Demo 
    15	{
    16	    public static void main( String[] args ) 
    17	    {
    18	        Terminal terminal = new Terminal();  // for input and output
    19	
    20	        // Prompt for and read a single integer.
    21	        int n = terminal.readInt( "Enter integer: " );
    22	        
    23	        // while tests a condition
    24	        terminal.print( "Fibonacci numbers <= " + n + ":" );
    25	        int thisOne = 1;
    26	        int lastOne = 1;
    27	        while ( lastOne <= n ) {
    28	            terminal.print( " " + lastOne );
    29	            int nextOne = thisOne + lastOne;
    30	            lastOne = thisOne;
    31	            thisOne = nextOne;
    32	        }
    33	        terminal.println();
    34	
    35	        // while tests a boolean variable
    36	        terminal.print( "Fibonacci numbers <= " + n + ":" );
    37	        thisOne = 1;
    38	        lastOne = 1;
    39	        boolean more = true;
    40	        while ( more ) {
    41	            if ( lastOne > n ) {
    42	                more = false;
    43	            } 
    44	            else {
    45	                terminal.print( " " + lastOne );
    46	                int nextOne = thisOne + lastOne;
    47	                lastOne = thisOne;
    48	                thisOne = nextOne;
    49	            }
    50	        }
    51	        terminal.println();
    52	
    53	        // while used for counting
    54	        terminal.print( "First " + n + " Fibonacci numbers:" );
    55	        thisOne = 1;
    56	        lastOne = 1;
    57	        int i = 1;
    58	        while ( i <= n ) {
    59	            terminal.print( " " + lastOne );
    60	            int nextOne = thisOne + lastOne;
    61	            lastOne = thisOne;
    62	            thisOne = nextOne;
    63	            i++;  // same as 'i = i + 1;'
    64	        }
    65	        terminal.println();
    66	    }
    67	}