Friday, November 25, 2016

Simple Encryption and Decryption program in C

#include<iostream.h>
#include<stdio.h>
#include<conio.h>
#include<string.h>

void decrypt(char a[],int n)
{
 int i;
 for(i=0;i<strlen(a);i++)
 {
  a[i]=a[i]-n;
  }
 }

 void encrypt(char a[],int n)
 {
  int i;
  for(i=0;i<strlen(a);i++)
  {
   a[i]=a[i]+n;
   }
  }

  void main()
  {
   char name[100];
   clrscr();
   cout<<"enter a string\n";
  // cin>>name;
  gets(name);
   cout<<"original string:"<<name<<"\n";
   encrypt(name,4);
   cout<<"encrypted string:"<<name<<"\n";
   decrypt(name,4);
   cout<<"decrypted string:"<<name<<"\n";
   getch();
  }

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