Calculate the sum, the product and the average of a sequence of non-zero digits entered on the keyboard, knowing that the sequence is ended by zero. Just count the numbers (0, 1 ... 9) when entering data and beep if the data comes out of this range.

#include <stdio.h>
#include <conio.h>

void maiCOUNT()
{
	int  X;  
 	int  COUNT=0;  
 	int  SUM=0;  
 	long PROD=1;  

 	do
    	{
     		printf("Enter digit number %d: ",(COUNT+1));
     		scanf("%d", &X);

     		if (X<0||X>9)
        		printf("\a");
     		else if (X)
        	{
         		COUNT++;
         		SUM+=X;
         		PROD*=X;
        	}
     		else if (!X && N>0)
         	{	/* ony if 1 digit was accepted */
         		printf("Sum     = %d \n", SUM);
         		printf("Product = %ld\n", PROD);
         		printf("Average = %f \n", (float)SOM/N);
        	}
    	}while (X);

	getch();
}