/* big12.c check for 64 bit  long etc  int still 32 bit */
/*       gcc -o big big.c      -m64 needed on older OS  */
/*       ./big     output shows sizes */
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

static char * b; /* try malloc at 10GB */

static long fact(long n) /* n! */
{
  if(n<=1l) return 1l;
  return n*fact(n-1l);
}

int main(int argc, char *argv[])
{
  int i, int1;
  long n, long1;
  long long llong1;
  float fl1;
  double d1;
  size_t sz1;
  int * p1;

  printf("big12.c  compiled  gcc -o big12 big12.c (64 bit long)\n");
  printf("-m64 needed on some older OS \n");

  printf("sizeof(sizeof(int))=%ld, sizeof needs pct ld \n",
	 sizeof(sizeof(int)));
  printf("sizeof(int)=%ld, sizeof(int1)=%ld \n",
	 sizeof(int), sizeof(int1));
  printf("sizeof(long)=%ld, sizeof(long1)=%ld \n",
	 sizeof(long), sizeof(long1));
  printf("sizeof(long long)=%ld, sizeof(llong1)=%ld \n",
	 sizeof(long long), sizeof(llong1));
  printf("sizeof(float)=%ld, sizeof(fl1)=%ld \n",
	 sizeof(float), sizeof(fl1));
  printf("sizeof(double)=%ld, sizeof(d1)=%ld \n",
	 sizeof(double), sizeof(d1));
  printf("sizeof(size_t)=%ld, sizeof(sz1)=%ld \n",
	 sizeof(size_t), sizeof(sz1));
  printf("sizeof(int *)=%ld, sizeof(p1)=%ld \n",
	 sizeof(int *), sizeof(p1));

  printf("n factorial with n of type long \n");
  for(n=0; n<25; n++)
  {
    printf("%ld ! = %ld \n", n, fact(n));
  }

  printf("trying to malloc 10GB \n");
  b = (char *)malloc(10000000000l);
  if(b==NULL) printf("malloc failed b==NULL \n");
  else
  {
    printf("malloc returned \n");
    for(n=0; n<10000000000l; n+=10000l) b[n]='a';
    printf("stored 10GB of 'a' \n");
  }

  return 0;
} /* end big12.c */