gistfile1.c

#include <stdio.h>
#include <stdlib.h>

int * bill2(int n) {
   int * a = malloc(sizeof(int)*n);
   int i;
   for (i = 0; i < n; i++)
      a[i] = i;
   return a;
}

long bill(int * a, int n) {
   long s = 0;
   int i;
   for (i = 0; i < n; i++)
      s += a[i];
   return s;
}

int main(void)
{
   int * a = bill2(100000000);
   printf("%ld\n", bill(a, 100000000));

   return 0;
}