rail

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



void main()

  FILE*fp ;
  FILE*fp1 ;
  FILE*r;
  int n;
  int i,j,k,l;
  char a[100],c[100],d[100],h[100];
  char buf[100];
  char *p;


  fp=fopen("encrypted.txt","a");
  fp1=fopen("decrypted.txt","a");
  r=fopen("search.txt","a");
  printf("\nEnter Plain Text : ");
  gets(a);
  l=strlen(a);


    for(i=0,j=0;i<l;i++)
     {
        if(i%2==0)
        c[j++]=a[i];
     }


    for(i=0;i<l;i++)
    {
      if(i%2==1)
      c[j++]=a[i];
    }

      c[j]='\0';
      printf("\n encrypted text : ",c);
      printf("\n %s",c);


  fprintf(fp," encrpyted text : %s \n ",c);

  if(l%2==0)
    k=l/2;
  else
    k=(l/2)+1;
  for(i=0,j=0;i<k;i++)
  {
    d[j]=c[i];
    j=j+2;
  }

  for(i=k,j=1;i<l;i++)
  {
    d[j]=c[i];
    j=j+2;
  }
    d[l]='\0';


printf("\n decrypted text : ");
printf(" \n %s",d);


fprintf(fp1," decrypted text : %s \n",d);

fprintf(r," decrpyted text: %s\n" ,d);


  fclose(fp);
  fclose(fp1);
	fclose(r);

  r=fopen("search.txt","r");

printf("\n \n \n ");

printf("search text:");
gets(h);

    while(fgets(buf,100,r))
    {

     p=strstr(buf,h);
     if(p!=NULL){

       printf( " \n word found: %s",p);
	n=1;

     }

    }

 if (n!=1){


       printf("word not found");



	 }







}