Decision Making and Looping

The program reads a list of positive values and calculates their average. The for loop is written to read 1000 values. However, if we want the program to calculate the average of any set of values less than 1000, then we must enter a 'negative' number after the last value in the list, to mark the end of input.

#include <stdio.h>
void main()
   {
       int m;
       float x, sum, average;
       printf("This program computes the average of a set of numbers\n");
       printf("Enter values one after another\n");
       printf("Enter a NEGATIVE number at the end.\n\n");
       sum = 0;
       for (m = 1 ; m <= 1000 ; ++m)
       {
    scanf("%f", &x);
    if (x < 0)
       break;
    sum += x ;
       }
       average = sum/(float)(m-1);
       printf("\n");
       printf("Number of values = %d\n", m-1);
       printf("Sum              = %f\n", sum);
       printf("Average          = %f\n", average);
       getch();
   }