ISC 2004 question on decoding

Active member

Can anyone give me the algorithm for this question. Its taken from ISC 2004 computer practical question paper.

Thanks.

Active member

Hope this helps you @ Aarthi
Here's the program.....

// ISC 2004 Q2
// To accept a string of integers and reverse them.Then to extract out meaningful ASCII codes
// of capital and small alphabets and also including spaces.
import java.io.*;
class ISC_2004_decoder
{ int i;
String rev(String s)// returns reversed string
{ String s1="";int ln;
ln=s.length();
for(i=0;i<ln;i++)
{ s1=s.charAt(i)+s1; }
return(s1);
}
char asc(int a)// returns character corresponding to ASCII code
{ char ch;
ch=(char)(a);// explicit conversion of Integer to Character
return(ch);
}
int meaning(int b)// checks whether ASCII code is meaningful or not
{
int mn=0;
if((b>=65&&b<=90)||(b>=97&&b<=122)||(b==32))
{ mn=1;}
return(mn);
}
void main()throws IOException
{
int ln1,asint;char ch1;String s2="",srev;
InputStreamReader read=new InputStreamReader(System.in);
BufferedReader in=new BufferedReader(read);
System.out.println("Enter message to be decoded");
String st=in.readLine();// accepting integers in the form of a string
ln1=st.length();
System.out.println("The Decoded message is :");
srev=rev(st);
for(i=0;i<ln1;i++)
{ ch1=srev.charAt(i);
s2=s2+ch1;
asint=Integer.parseInt(s2);
if(meaning(asint)==1)// calling function meaning() to find out whether asint is a valid ASCII code
{
System.out.print(asc(asint));// calling function asc() to get the character with code integer asint
s2="";
}
}
}
}

Active member

Thanks a lot diptojit. Both your codes have been very useful! They are very simply yet efficient. Thanks a lot! Smile