#include<stdio.h>


int readData(FILE *fpOut, double list[],double*totalScore,int count[]);
void sortData(double list[],int current,int last);


int main(void)
{
	double testScore[50];
	double totalScore=0;
	double mean;
	int frequency[10]={0};
	int current;
	int last;
	int i;
	int numberScore;
	double median;
    FILE *fpOut;


	if ( (fpOut = fopen("random2.txt", "r") ) == NULL )
	{
		printf("Error opening file\n"); 
		return 100;
	}

	numberScore=readData(fpOut,testScore,&totalScore,frequency);
	mean=totalScore/numberScore;

   if ( fclose(fpOut) == EOF )
	{
		printf("Error closing file\n");
		return 200;
	}


	last=numberScore-1;
	for(current=0;current<last;current++)
	{sortData(testScore,current,last);}

	if((numberScore%2)==0)
	{
		median=(testScore[(numberScore/2)-1]+testScore[(numberScore/2)])/2.0; 

	}
	else
	{median=testScore[(numberScore+1)/2-1];}


	if ( (fpOut = fopen("result.txt", "w") ) == NULL )
	{
		printf("Error opening file\n"); 
		return 100;
	}

	fprintf(fpOut,"median: %7.2lf\n",median);
	fprintf(fpOut,"Mean : %7.2lf\n",mean);
	fprintf(fpOut,"Frequency 90 每 100 : %d\n",frequency[0]);
	fprintf(fpOut,"Frequency 80 每 89  : %d\n",frequency[1]);
	fprintf(fpOut,"Frequency 70 每 79  : %d\n",frequency[2]);
	fprintf(fpOut,"Frequency 60 每 69  : %d\n",frequency[3]);
	fprintf(fpOut,"Frequency 50 每 59  : %d\n",frequency[4]);
	fprintf(fpOut,"Frequency 40 每 49  : %d\n",frequency[5]);
	fprintf(fpOut,"Frequency 30 每 39  : %d\n",frequency[6]);
	fprintf(fpOut,"Frequency 20 每 29  : %d\n",frequency[7]);
	fprintf(fpOut,"Frequency 10 每 19  : %d\n",frequency[8]);
	fprintf(fpOut,"Frequency 0 每   9  : %d\n",frequency[9]);
	fprintf(fpOut,"Sorted Value\n");
	for(i=0;i<numberScore;i++)
	fprintf(fpOut,"%7.2f",testScore[i]);


	printf("result.txt is created\n");


	if ( fclose(fpOut) == EOF )
	{
		printf("Error closing file\n");
		return 200;
	}


	


	return 0;
}/*main*/


int readData(FILE *fpOut,double list[],double*totalScore,int count[])
{
	int i;
	for(i=0;i<50 && (fscanf(fpOut,"%lf",&list[i])!=EOF);i++) 
	{
	*totalScore=*totalScore+list[i];
	if(list[i]>=90)
		count[0]=count[0]+1;
	    else if(list[i]>=80)
			count[1]=count[1]+1;
		else if(list[i]>=70)
			count[2]=count[2]+1;
		else if(list[i]>=60)
			count[3]=count[3]+1;
		else if(list[i]>=50)
			count[4]=count[4]+1;
		else if(list[i]>=40)
			count[5]=count[5]+1;
		else if(list[i]>=30)
			count[6]=count[6]+1;
		else if(list[i]>=20)
			count[7]=count[7]+1;
		else if(list[i]>=10)
			count[8]=count[8]+1;
		else if(list[i]>=0)
			count[9]=count[9]+1;
	}
	return i;
	
}


void sortData(double list[],int current,int last)
{
	int walker;
	double temp;

	for(walker=last;walker>current;walker--)
		if(list[walker] < list[walker-1])
		{
			temp=list[walker];
			list[walker]=list[walker-1];
			list[walker-1]=temp;
		}
		return;
}