C program to create a function in which user pass the array with size n and function return the average

Write a function which accepts an array of size n containing integer values and returns the average of all values. Call the function from main program.

 #include<stdio.h>
 float findAverage(int*,int);
 int main()
 {
 	int num[100],n,a;
	float avg;
 	printf("How many element you want to store : "); 
 	scanf("%d",&n);
 	for(a=0;a<n;a++)
 	{
 		scanf("%d",&num[a]);
	}
	avg=findAverage(num,n);
	printf("The average of array is: %f",avg);
	return 0;
 }
 float findAverage(int *ptr,int n)
 {
 	int a,sum=0;
 	float res;
 	for(a=1;a<=n;a++)
 	{
 		sum=sum+*ptr;
 		ptr++;
	}
	res=(float)sum/n;
	return(res);
 }

How many element you want to store : 5

3

4

5

6

7

The average of array is: 5.000000