Hey guys,

I'm having a little trouble putting this together. I believe I have the formula correct on the bottom, but I can't seem get the program to work. The idea is that it needs to be able to run like this:

./sdev < input.file

I have a simple understanding of how to up it together in concept, but not entirely sure on how to actually put it together in C.

```
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
void statistics (const int *arr, int n, float *average, float *std_dev)
int main ()
{
while(fscanf(input, "%d", &i) !=EOF);
{
n++;
}
int sum = 0;
int sum_squares = 0;
float variance;
float average;
float std_dev;
int i;
for (i = 0; i < n; i++)
{
sum += aar[i];
sum_squares += arr[i]*arr[i];
}
*average = sum / n;
variance = sum_squares / n - (*average) * (*average);
*std_dev = sqrt (variance);
printf("The average is %d\n" , *average);
printf("The standard deviation is %d\n" , *std_dev);
return(0);
}
```

I've found a few example of standard deviations in C online, but many of those are done with a fixed number of array. I was hoping someone can walk me through his.