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;

}

Write a program in ‘C’ that will accept 10 numbers from the user, sort them & then perform the binary search. The searching number will be arithmetic mean of the 10 numbers accepted from the user. Write the sort() & binSearch() functions for performing the sorting & binary search. Also create display function() for displaying the list. Sort() function will use selection sort and only receive one argument (Single char type)as type of sorting i.e. ascending (a) or descending (d). Display the list after sorting using a display() function. binSearch() function will accept one argument as a number to be search & return null or the index position of that number in the array. display() function is non argument non return type function. It will simply display the list row-wise. Program should use these functions by displaying the appropriate message for found or not found.

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