calculating average using user input:
int count=0, average, total=0, number;
printf("Enter the first number: ");
scanf("%d", &number);//5
while (number != -1){
count++;
total=total + number;
printf("Enter the next number or enter -1 to get average: ");
scanf("%d", &number);//5 the third time we will enter -1
}
average=total/count;
printf("Average = %d\n", average);