Answer / hafiz waqas

import java.util.Scanner;


public class Main {


public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner myScanner=new Scanner(System.in);

boolean flag = true; //check value is 4 digit or not..
int beforeIncryption = 0;//take plain text
int temp; // for processing plain text
int incryptValue; // for storing after encryption process

//Check value is 4 digit or not
while(flag){
System.out.println("Please Enter exactly 4 digit enteger ");
beforeIncryption = myScanner.nextInt();

if( beforeIncryption-1000 >= 0 && beforeIncryption-1000
<= 8999)
flag=false;
}
temp = beforeIncryption;

int v1 , v2 , v3,v4;// v1 contain 1st digit,v2 contain 2nd
digit and so on...

//take separate digit and apply encryption process
v4=temp%10;
v4+=7;
v4%=10;

temp/=10;

v3=temp%10;
v3+=7;
v3%=10;

temp/=10;

v2=temp%10;
v2+=7;
v2%=10;

temp/=10;

v1=temp%10;
v1+=7;
v1%=10;

//swapping values 1st digit with 3rd digit and 2nd with
4th....
temp=v1;
v1=v3;
v3=temp;

temp=v2;
v2=v4;
v4=temp;


incryptValue = v1*1000 + v2*100 + v3*10 + v4*1;// combine
4 separate digit into 1 number
System.out.println("Encrypted data is
"+incryptValue);//display encryption result


//Program for decryption........

int myIncrypt;//take encrypted input from user
System.out.println("Enter encrypted data ");//prompt for user
myIncrypt=myScanner.nextInt();//take value for apply
decryption process

int dv1,dv2,dv3,dv4,decryptValue;

//separate 1 four digit number into 4 separate 1 digit number
dv4=myIncrypt%10;
myIncrypt/=10;

dv3=myIncrypt%10;
myIncrypt/=10;

dv2=myIncrypt%10;
myIncrypt/=10;

dv1=myIncrypt%10;
myIncrypt/=10;

//swap values
temp=dv1;
dv1=dv3;
dv3=temp;

temp=dv2;
dv2=dv4;
dv4=temp;

//apply decryption process
dv1+=10;
dv1-=7;
dv1%=10;

dv2+=10;
dv2-=7;
dv2%=10;

dv3+=10;
dv3-=7;
dv3%=10;

dv4+=10;
dv4-=7;
dv4%=10;

//combine result
decryptValue=dv1*1000+dv2*100+dv3*10+dv4*1;
//display result
System.out.println("decrypted data is"+decryptValue);

}

}

Answer / ferial hattar

#include<iostream.h>
void main()
{
int n,a,b,c,d,e,f,g,h,i,j;

cout<<"enter 4 number digit";
cin>>n;

a=n%10;

b=n/10;

c=b%10;

d=b/10;

e=d%10;

f=d/10;


g=((a+a)+7)%10;

h=((c+c)+7)%10;

i=((e+e)+7)%10;

j=((f+f)+7)%10;


cout<<i<<g<<j<<h;

}

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