How to print ASCII values of all characters?

[Anu satya]

Hello all,

I have one assignment to print ASCII values of all characters using java.
i.e.Console application.

Can anyone Please guide me in this regard?

[Stuart Ash]

Loop through the characters in a FOR loop and print out the value of the char which is cast to int.

Try this.

I am pasting the answer below, but suggest you first try it based on the above explanation, without looking at the code below.

[deleted - Jim]
[ November 17, 2005: Message edited by: Jim Yingst ]

[Jim Yingst]

Ahem. At this site we really prefer not to simply give people the answer. So I deleted it from the previous post.

Ashvini: some questions for you to consider:

What is the largest (and smallest) possible value of a char variable in Java?

What is the largest (and smallest) possible ASCII value?

If a char is a type of integer value, what's a way to convert from one type of number to another? For example, how could you convert a double to an int?

[Stuart Ash]

Originally posted by Jim Yingst:
Ahem. At this site we really prefer not to simply give people the answer. So I deleted it from the previous post.

Alright Jim. I was in double mind too, but decided to leave it to the asker the restraint of not looking at the answer. But if this is the preferred approach...

[Anu satya]

Jim,
I really don't know answer for both the questions....I will write the code. Please guide me with the logic and the ASCII concept.

[Stan James]

Help us understand where you are ...

Are you comfortable with making a one-class program, main() method and getting it running?

Are you comfortable with for loops, say incrementing an int from 0 to some limit?

Are you comfortable with the relationship between int and char?

Do you have a good book or reference to help with things like this? Thinking In Java is a good free online book.
[ November 21, 2005: Message edited by: Stan James ]

[Anu satya]

James,
I am an intermediate programmer in java.
Yes, i am comfertable with single class and running it.
I am capable of doing complex loops
I know the convertion of ASCII code to String:

int i = 64;
String aChar = new Character((char)i).toString();

I know the convertion of integer to ASCII code (byte)

char c = 'A';
int i = (int) c; // i will have the value 65 decimal

Anticipating some guidelines at the earliest....Thanks in advance

[Stuart Ash]

Ashvini, do you find any lack of clarity in the algorithm I suggested above??

[Anu satya]

Ash,

you wrote:
"Loop through the characters in a FOR loop and print out the value of the char which is cast to int."

But,
I am not understanding two concepts:
1) How to input characters,for which ASCII values has to be displayed ?
2) What should be the minimum and maximum limits for the loop?

[Sri Ram]

Originally posted by Ashvini Devi:
Ash,

But,
I am not understanding two concepts:
1) How to input characters,for which ASCII values has to be displayed ?
2) What should be the minimum and maximum limits for the loop?

That lies in Stans post. If u are able to answer both Stans Q, then u have the program. Thats a clue.

[Stan James]

I think we're homing in on what's missing. Google on 'ASCII character set' to find the range of numbers. Note that quite a few of them do special things when printed, eg tab or newline or ring the bell on the printer (your printer doesn't have a bell?) so it can be a little tricky to print a nice grid of all the characters. Consider a map or something to look up the descriptive names of these special characters.

[Anu satya]

Hi,
I am trying to write the program.
I am asking user to strike a key on the keyboard. With respect to that, ASCII value has to be printed.
I am first converting the string to int and then int to ASCII value.

But:
my problem is:
1)I am getting exception as String "a" cano't be converted in to int.
2)how to convert string to Char?
3)How to findout, whether the user input is a number or a character ?

Please help! i am posting my code here.

import java.io.*;
public class Asci
{
public void getChars()
{
int x=0;
String str="";
//boolean contain=false;
try
{
System.out.print("Enter a Char:  ");
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
str=in.readLine();
System.out.println("Str is: "+str);
x=Integer.valueOf(str).intValue();//Converting String to integer
System.out.println("int value is: "+x);
int i = (int) x; 
System.out.println("Ascii value is :"+i);
System.out.println(i);
}catch(Exception e)
         {System.out.println(e);}
}//end of getChar
public static void main(String[] args)
{
Asci as=new Asci();
as.getChars();
}
}//end of class

[Anu satya]

Otherwise,
as Ash said, i don't know how to loop through all the characters to print at a stretch. i want the ASCII values from 32 to 127... (need not be all characters)

Thanks in advance.

:roll:

[Jim Yingst]

Can you write a loop with a variable which starts at 0 and ends at 10?

Can you write a loop with a variable which starts at 32 and ends at 127?

[Anu satya]

YEs.
My program is working now.
Thanks to all

[santhosh.R gowda]

Ashvini Devi wrote:Hello all,

I have one assignment to print ASCII values of all characters using java.
i.e.Console application.

Can anyone Please guide me in this regard?

-----------------------------------------------------------------------------------------------------
hi Ashvini

[Deleted]

[Maneesh Godbole]

Santosh,

Do you really think the OP is waiting these many years for the solution? (..and if you have read the OP's last post, she did say she got it).

[Henry Wong]

Also ... it is nicer to help someone solve their homework assigment instead of just giving them the solution. (You can't learn if you just get the solution).... I deleted the solution, just in case, another student from the same instructor needs to do the same assigment.

Henry