Getline One - C

#include <stdio.h>

int main() {
  size_t size = 100;
  char p[size], *pp = p;
  int num = 0, x, ant = -1;
  double sum = 0;
  while(getline(&pp, &size, stdin) != EOF) {
    scanf("%d", &x);
    if(x == ant) continue;
    ant = x, sum += x, ++num;
  }
  printf("%.1lf\n", sum / num);

  return 0;
}