I'm trying to figure out what this source code does. I keep on getting an error message.

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

double number_array[30];
int count = 0;

double calc_sum();
void print_list();
double get_number();

double calc_mean(double *list) {
double sum = calc_sum(list);
return sum / count;
}

double calc_std_dev(double *list) {
int index = 0;
double sum = 0;

double mean = calc_mean(list);

while (list[index] != 0) {
sum += (list[index] - mean) * (list[index] - mean);
index++;
}

return sqrt(sum / (count -1));
}

void create_list() {
int number = 0, index = 0;

do {
number_array[index] = get_number();
number = number_array[index++];
} while (number != 0); // if user enter 0, quit

count = index - 1;
}

void read_from_file() {
}

int main() {
create_list();
print_list(number_array);
printf("mean = %f \n", calc_mean(number_array));
printf("std dev = %f \n", calc_std_dev(number_array));
}

please use code tags!!!!
this is what it is supposed to do it you were to post all of it
and without knowing what that unknown error is
there is no way to help

so
PLEASE READ the guide on posting
http://www.linuxquestions.org/linux/...Ask_a_Question
and included the NEEDED information

the operating system you are using ?
the version of said OS ?
the FULL build line you are using
and the MOST important part
THE ERROR !!!!!

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