Can't manipulate variable!

So here I am writing this code and I am having problems with something basic, but I think I am overlooking something simple. Reading a text file I had to come up with arithmetic sum and root-mean-square average. the arithmetic sum is fine but the root-square-mean isn't correct because after the first while loop i can't change it.

Code:

Code:

-4.1 -2.2 -0.5  1.2  3.3  4.6  5.1  2.1  0.2 -3.6 -4.1  0.2
 0.5  2.2  4.1 -0.2 -1.2 -3.3 -4.6 -5.0 -2.2 -1.1  0.8	3.2
-0.1 -4.8

And here is the Code

Code:

Code:

/* Christopher R Smith
COMP1200 - Fall 2008
Assignment 6
Program: Average Value Program

-------------------------------------------------------------------------------------------------------------
Taking surface measurements from a text file, compute and display the Arithmetic Mean Value, the
Root Mean Square Average, and the Max Roughness Height

--------------------------------------------------------------------------------------------------------------
*/

#include <stdio.h>
#include <math.h>

int main()
{
FILE 		*inp;
double	value, 	
			mean,
			root_mean_square,
			sum=0,
			max_height;
int 		numValue=0,
			count;
		

inp = fopen("surface.txt", "r");		

while ( ( fscanf ( inp,"%lf", &value ) ) == 1 )
	{
		  sum += fabs(value);
		  numValue++;
		  
	}

mean = sum / numValue;

while ( ( fscanf ( inp,"%lf", &value ) ) == 1 )
	{
		  sum += pow( fabs(value), 2 );
		  numValue++;
		  
	}

root_mean_square = sqrt( sum / numValue);



while ( ( fscanf ( inp,"%lf", &value ) ) == 1 )
	{
		double max=-10000, min=10000;

				
				if (value >= max)
						max = value;
				else 
						min = value;
							
		;
			max_height = max - min
	}
		

	
printf( "Arithmetic mean value %.2lf\n", mean);
printf( "Root-mean-square average %.2lf\n", root_mean_square);
printf( "Maximum roughness height %.2lf\n", max_height);					







return (0);
}

i am getting

Code:

64.500000
Arithmetic mean value 2.48
Root-mean-square average 1.58
Maximum roughness height 1889828851749420549890302903237191694835027000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.00

No matter what I do to

Code:

while ( ( fscanf ( inp,"%lf", &value ) ) == 1 )
	
			sum =+ pow ( (fabs(value)), 5);

I can't manipulate the sum , it stays at 64.5000000 from the first calculation in

Code:

while ( ( fscanf ( inp,"%lf", &value ) ) == 1 )
	{
		  
		  sum += fabs(value);
		  numValue++;
		  
	}

mean = sum / numValue;

At the end of your first WHILE loop, you have fscanf()'ed all the way through the file. You leave the loop because you hit end of file.

In your second (and subsequent) WHILE loops, you are still sitting at EOF.

edit: I would do everything in one pass.

How many times do you set numValue = 0?
How many loops to you increment it in?