lab 4 part B

#include <stdio.h>
#include <math.h>
double aver(double num1,double num4){
return ((num1)/num4);
}
double addition(double num1,double num2){return num1+num2;}
int main(void) {
double X;
double average;
double trials;
double i=0;
double sum;

do{
printf("\nEnter the test scores: ");
scanf("%lg",&X);
sum=addition(X,sum);
i++;}
while(X>=0);
sum-=X;
average=aver(sum,i-1);
printf("Average is %lg",average);
return 0;}