Write and Read String from File

#include<stdio.h>

#include<conio.h>

void main()

{

  FILE *fp1;

  char *s,ch;

  int c=0;

  clrscr();

  fp1=fopen("string1.txt","w");

  do

  {

    fflush(stdin);

    printf("\n Enter any string : ");

    gets(s);

    fputs(s,fp1);

    printf("\n Do you want to continue [y-n] : ");

    ch=getchar();

    if(ch=='y')

     {

          fputs("\n",fp1);

     }

  }while(ch=='y');

  fclose(fp1);

  if((fp1=fopen("string1.txt","r"))==NULL)

   {

      printf("\n Error " );

      exit(0);

   }

   while(!(feof(fp1)))

    {

       fgets(s,50,fp1);

       printf("\n %s",s);

       c++;

    }

   printf("\n Total number of lines : %d",c);

   getch();

  }