A basic method with an unexpected output

[JONCOM]

I have a very basic piece of code here that is acting strangely. What the code should do: prints a range of numbers and a character beside each number, one per line.

Here is the code:

public class CharacterClass
{
    public static void RangeOfChars(int lowrange, int highrange) {
        System.out.println("=====================");
        for(int i=lowrange; i<=highrange; i++)
            System.out.println(i + " " + (char)i);
        System.out.println("=====================");
    }
}

But when I run this method using the method call RangeOfChars(0,100) I get the following output:

< This line is left blank >
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
32  
33 !
34 "
35 #
36 $
37 %
38 &
39 '
40 (
41 )
42 *
43 +
44 ,
45 -
46 .
47 /
48 0
49 1
50 2
51 3
52 4
53 5
54 6
55 7
56 8
57 9
58 :
59 ;
60 <
61 =
62 >
63 ?
64 @
65 A
66 B
67 C
68 D
69 E
70 F
71 G
72 H
73 I
74 J
75 K
76 L
77 M
78 N
79 O
80 P
81 Q
82 R
83 S
84 T
85 U
86 V
87 W
88 X
89 Y
90 Z
91 [
92 \
93 ]
94 ^
95 _
96 `
97 a
98 b
99 c
100 d
=====================

What happened to numbers 0-12 and why aren't they listed above?

[Iron Lion]

Since Unicode developed from ANSI, which in turn developed from ASCII, it has the same non-printable characters at the start of its character set.

Wikipedia: ASCII control characters

[JONCOM]

Since Unicode developed from ANSI, which in turn developed from ASCII, it has the same non-printable characters at the start of its character set.

Wikipedia: ASCII control characters

I still don't understand why 0-12 aren't at the very least displaying a number.

On the other hand then, why are 13-32 displaying numbers at all?

PS - I did follow your link. But that doesn't explain this behavior, does it?

[Junky]

2 options

Perhaps the input to the RangeOfChars method is not 0 as you expect.

Priobably more likely is that there is so much output that the first few lines have scrolled off the page and is no longer viewable. Try redirecting output to a file so you can see it all.

C:\Directory>java ProgramName > output.txt

[JONCOM]

2 options

Perhaps the input to the RangeOfChars method is not 0 as you expect.

Priobably more likely is that there is so much output that the first few lines have scrolled off the page and is no longer viewable. Try redirecting output to a file so you can see it all.

C:\Directory>java ProgramName > output.txt

I don't think that code you gave me compiles, and I'm not sure what minor (or major) tweaks will make it compile. Would you mind giving me the code to direct my output to a text file so I can try out your suggestion?

Thanks.

[m00nchile]

That's not code, but a command prompt instruction. Did you jump straight to an IDE, no notepad + command prompt to get you started?

[JosAH]

Character 0x0c (decimal 12) is the 'form feed' character and it clears the screen on some terminals. So, characters 0, 1, 2, ... 11 are printed, then the screen is cleared and the characters in the range 13, 14, ... are printed.

kind regards,

Jos