Write a C function that computes the average of all numbers on the stack.

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This exercise is mostly suitable for students 
double average(stack s)
{
	element e;
	int sum=0, count=0;
	while(Top(s,&e))
	{
		Pop(&s);
		sum+=e;
		count++;
	}
	return sum*1.0/count;
}
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