/*
Author  : Michael Robinson
Program : files.c
Purpose : To open, read, write and close files, and 
          present the if, else if, and else commands
Updated : Jul 1, 2014

Purpose : - opens and reads data from an existing file (input)
          - creates an output file (output)
          - writes data from input file into output file
          - closes both files
*/


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


FILE  *inp;  // pointer to the file inp 
FILE  *outp; // pointer to the file outp

float miles = 0;
char  bases = '\0';


//To pause program and ask use to press enter to continue.
void pause()
{
    printf("Press any key to continue ...\n") ; 
    getchar() ; 
}


void  writePa01Backwards()
{
   inp = fopen("pa01Probes.dna", "r");
  
   int amtOfRecords = 0;
   char array[1500];
   char record[50];

   while (fgets(record, 100, inp) != NULL) 
   {
      printf("%s", record);
      strcpy(&array[ amtOfRecords ], record); //
      printf( "%s", &array[amtOfRecords] );
      amtOfRecords++;
      pause();
   }

   outp  = fopen("backwards.dna", "w");

   int x = 0;
   for(x = amtOfRecords -1 ; x > -1; x--)
   {
      //fprintf( outp, "%s\n", array[x] );
      printf( "[%s]\n", &array[x] );
      printf( "%s", &array[amtOfRecords] );
   }

/*	out = fopen("reverse.txt", "w");
	//Prints in reverse onto the file
	for( i = x; i > -1; i--)
	{
		fprintf(out, "%c\n", array[i]);

	}
*/

}


void read1200dna()
{
   inp = fopen("distance.txt", "r");
}


void readAndWriteEntireFile()
{
   inp = fopen("distance.txt", "r");
   int record = 0;

   while(fscanf(inp,"%f", &miles) != EOF) 
   {   
      printf("Record %d = %.2f\n", record++, miles);
   }
   
   printf("\n");

   fclose(inp);
}


void readTextFileAndCompute()
{
   inp  = fopen("distance.txt", "r"); //open file for reading
   outp = fopen("distance.out", "w"); //open file for writting
 
 
   while( fscanf(inp,"%f", &miles) != EOF) 
   { 
       fprintf(outp, "The distance in miles is %.2f\n", miles); //write data to outp file pointer
       printf("The distance in miles is %.2f\n", miles); //display data 
   } 

   fclose(inp);  //close inp
   fclose(outp); //close outp 

   inp = fopen( "1200.dna", "r" );
   fscanf(inp, "%s", &bases);
   //printf("\ndna = %s\n\n", bases);

}//end void readTextFileAndCompute()


int main()
{
   readTextFileAndCompute();
   pause();
   
   readAndWriteEntireFile();
   pause();
   
   read1200dna();
   pause();
   
   writePa01Backwards();
 
   exit(0);
}