average using function

/* average using a function */
#include<conio.h>
#include<stdio.h>
void main()
{
	float avg(float[]);
	float a[5]={12.5,11.5,13.5,15.2,20.5};
	float average;
	clrscr();
	average=avg(a);
	printf("Average of 5 numbers is %f",average);
	getch();
}
float avg(float a[5])
{
	int i;
	float sum=0;
	for(i=0;i<5;i++)
	{
		sum=sum+a[i];
	}
	return (sum/5);
}