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

int main( int argc, char * argv[] )
{
	FILE * rawFile;
	FILE * outFile;
	int i=1, index=0;
	char * oneLine=NULL;
	int dropArr[10];		/* index from 0 to 13*/
	double doubleVal=0.0;
	float dropRate=0.0;
	double dVar=0.0, average=0.0;

	if ( argc != 3 )
	{
		fprintf(stderr, "usage: %s inputfile outputfile \n", argv[0] );
		exit( EXIT_FAILURE );
	}

	if( (rawFile = fopen( argv[1], "r" )) < 0 )
	{
		fprintf(stderr, "Error opening %s \n", argv[1] );
		exit( EXIT_FAILURE );
	}
	if( (outFile = fopen( argv[2], "w" )) < 0 )
	{
		fprintf(stderr, "Error opening %s \n", argv[2] );
		exit( EXIT_FAILURE );
	}

	/* initialize the dropArr*/
	for( i=0; i<10; i++)
		dropArr[i] = 0;
	/* allocate memory for oneLine */	
	oneLine = malloc( 64 );

	while ( (oneLine = fgets( oneLine, 64, rawFile )) != NULL )
	{
		if ( strstr( oneLine, "." ) )
		{
			sscanf( oneLine, "%f", &dropRate );
			index=-1;
			continue;
		}

		/* get elapse time in the array */
		index++;
		sscanf( oneLine, "%d", &dropArr[index]);
		printf("num is: %d\n", dropArr[index]);/* for debugging purpose */
		if ( index == 9 )
		{
			/* this is the last elapse data, put the arry in the file */
			/* calculate the average time and the throughput */
			/* BE SURE TO USE DOUBLE TYPE WHEN YOU DO CALCULATION :w*/
			average=0.0;
			for( i=0; i<10; i++)
			{
				doubleVal = (double) dropArr[i];
				average += doubleVal/10;
				fprintf( outFile, " %d", dropArr[i] ); 
			}
			/* average dropArr[11]*/
			fprintf( outFile, " %f", average ); 
			printf( "average: %f\n", average ); 

			/* average devication dropArr[12]*/
			dVar =0.0;
			for( i=0; i<10; i++ )
			{
			doubleVal = (double) (dropArr[i]-average);
			doubleVal = doubleVal*doubleVal;
			dVar += doubleVal/10;
			}
			dVar = sqrt( dVar );
			fprintf( outFile, " %f\n", dVar ); 
			printf( "Var: %f\n", dVar ); 
		}/* end of index=10*/

	}/* end of while */

	return 0;
}/* end of main */