File: main.c

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#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <errno.h>

int main()
{
  if(CHAR_BIT*sizeof(long)<=64)
  {
    char * a[] = { "0x7fffffffffffffffF", "-0x7fffffffffffffffF" };

    errno=0;
    assert(strtol(a[0], 0, 16)==LONG_MAX);
    assert(errno==ERANGE);

    errno=0;
    assert(strtol(a[1], 0, 16)==LONG_MIN);
    assert(errno==ERANGE);
  }

  return 0;
}