• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Paul Clapham
  • Ron McLeod
  • Bear Bibeault
  • Liutauras Vilda
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Junilu Lacar
Saloon Keepers:
  • Tim Moores
  • Tim Holloway
  • Stephan van Hulst
  • Jj Roberts
  • Carey Brown
Bartenders:
  • salvin francis
  • Frits Walraven
  • Piet Souris

how to read integers from keyboard?

 
Ranch Hand
Posts: 32
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi all
One of my course assignment wants me to read integers from
keyboard. i've tried InputStream and DataInputStream methods but
i am not able to do it. so please tell me how to read integer
from keyboard.
With regards
ramesh
------------------
 
Ranch Hand
Posts: 110
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I guess the first question is how the numbers are typed in. Are they typed in one per line or many per line. Haven't compiled this but this should work for one per line.
DataInputStream din = new DataInputStream(System.in);
while((String s = din.readLine()) != null)
{
int tmpValue = Integer.parseInt(s);
}
If there are many per line look at using the StringTokenizer class.

[This message has been edited by Van Glass (edited November 19, 2000).]
 
Greenhorn
Posts: 12
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
readLine() is deprecated with DataInputStream. The following can also be used instead :
System.out.println("Enter an Integer :");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in);
int i=Integer.parseInt(br.readLine());
System.out.println("Entered Integer is :"+i);
Kiran
 
Greenhorn
Posts: 10
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
hi,
i think u should try this.
import java.io.*;
class useint{
public static void main (String args[])
throws IOException {

BufferedReader b = new BufferedReader
(new InputStreamReader(System.in));
String string;
int i;
int sum = 0;
System.out.println("Please input numbers:");
System.out.println("Type 0 to exit");

do{
string = b.readLine();
try{
i = Integer.parseInt(string);
} catch(NumberFormatException NFE){
System.out.println("Please try again");
i = 0;
}

sum = sum + 1;
System.out.println("Count = " sum);
} while(i != 0);
}
}
 
And inside of my fortune cookie was this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop
https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton
reply
    Bookmark Topic Watch Topic
  • New Topic