Thread: reading data from a file till its the end of the file using I/O redirection

Im have trouble reading a file till its the end of a file using I/O redirection with my Quincy 2005 compiler. My first while loop is supposed to do this and i dont know how to start it. Can someone please help me.

Code:

#include<stdio.h>

int main (void)
{
	int sampleID;
	int i, j;
	double num_of_genes;
	int length_exon;
	int intron;
	int countC = 0;
	int countA = 0;
	int countT = 0;
	int countG = 0;
	char x, y;
	double meanA;
	double meanC;
	double meanT;
	double meanG;
	int type;
	int counter;
	
	printf("\nID    mA     mT      mG     mC    Type");
	while (counter < 30)
	{
		scanf("%d", &sampleID);
		scanf("%d", &num_of_genes);
		scanf("%d", &length_exon);
	
		intron = 3 * length_exon + 1;
		for (i = 0; i < num_of_genes; i++)
		{
			while(scanf("%c", &x) <= length_exon)
			{
				if (x == 'A')
					countA++;
				else if (x == 'C')
					countC++;
				else if (x == 'T')
					countT++;
				else if (x == 'G');
					countG++;
				for (j = 0; j <= intron; j++)
					scanf("%c", &y);
			}
			
		}
		meanA = countA / num_of_genes;
		meanC = countC / num_of_genes;
		meanT = countT / num_of_genes;
		meanG = countG / num_of_genes;
		if (meanC <= meanA && meanA <= meanT && meanT <= meanG)
			type = 1;
		else if (meanA <= meanC && meanC <= meanT && meanG > 0)
			type = 2;
		else
			type = 3;
			
		printf("\n%d    %lf     %lf      %lf     %lf    %d", sampleID, meanA, meanT, meanG, meanC, type);
		counter++;
		
	}
	return 0;
}