mean_value function 

1. Definition:

The mean (average) value (arithmetic) of a set of values is equal to their sum 
divided by the number of the related values.


2. The method in C language:


	#include <stdio.h>


	int get_number()
	{
	int num;
	printf("n How many numbers do you have ?: --> ");
	scanf("%d", &num);
	return num;
	}


	int main()
	{
	int num = get_number();
	float numbers[num];

	printf("n Enter these %d numbers:n",num);
	int i;
	for (i = 0; i<num;i++)
	{
	scanf("%f", &numbers[i]);
	}

	float mean_value;
	float sum = 0;

	for (i = 0; i<num;i++)
	{
	sum = sum + numbers[i];
	}
	mean_value = sum/num;

	printf("n The sum of these numbers is %5.2f n", sum);
	printf("n Their mean value is %5.2f n", mean_value);

	return 0;
	}