Encryption is a technique of coding messages to maintain their secrecy. A String array of size 'n' where 'n' is greater than 1 and less than 10, stores single sentences (each sentence ends with a full stop) in each row of the array.
Write a program to accept the size of the array.
Display an appropriate message if the size is not satisfying the given condition.
Define a string array of the inputted size and fill it with sentences row-wise. Change the sentence of the odd rows with an encryption of two characters ahead of the original character.
Also change the sentence of the even rows by storing the sentence in reverse order. Display the encrypted sentences as per the sample data given below.
Test your program on the sample data and some random data.
Example 1
INPUT: n = 4
IT IS CLOUDY.
IT MAY RAIN.
THE WEATHER IS FINE.
IT IS COOL.
OUTPUT:
KV KU ENQWFA.
RAIN MAY IT.
VJG YGCVJGT KU HKPG.
COOL IS IT.
import java.io.*;
class ISCprac2011q02{
public static void main(String args[])
throws IOException{
BufferedReader br=new BufferedReader(
new InputStreamReader(System.in));
int nos;
System.out.print("Enter number of sentences : ");
nos=Integer.parseInt(br.readLine());
if(nos<1 || nos>=10)
System.out.println("\nInvalid Entry");
else{
int i,j,p,l;
String s[]=new String[nos];
System.out.print("\nEnter "+nos+" sentences : ");
for(i=0;i< nos;i++)
s[i]=(br.readLine()).toUpperCase();
for(i=0;i< nos;i++)
{
String t;
s[i]=" "+s[i];// add a blank space before each sentence
l=s[i].length();
if(i%2==0){
t="";
for(j=0;j< l;j++){
// store the ASCII code of the character
int ch=s[i].charAt(j);
if(ch!=32 && ch!='.'){
ch=ch+2;//shift the letter two spaces
if(ch>90)//to maintain cyclic order
ch=ch-26;// subtract 26
}
//convert to character and add to a temporary string
t=t+(char)ch;
}
s[i]=t.trim();// remove leading or trailing spaces
}else{
t="";
p=l-1;
for(j=l-1;j>=0;j--){
//reverse loop to start extraction of words
//from last to first
char ch=s[i].charAt(j);
if(ch==' '){
t=t+s[i].substring(j+1,p)+" ";
// add the extracted word and a space
p=j;
}
}
t=t+".";
s[i]=t;
}
}
System.out.println("\nOUTPUT:");
for(i=0;i< nos;i++)
System.out.print(s[i]);
}
}
}
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