サンプル

/* rec.c */
foo(int count)

{

  printf("%4d: %p\n", count, &count);

  if (count <= 0) {

    return;

  }

  foo(count - 1);

}
bar(int count)

{

  if (count > 0) {

    bar(count - 1);

  }

  printf("%4d: %p\n", count, &count);

}
main()

{

  foo(10);

  printf("\n\n");

  bar(10);

}

/* unsig.c */

#include 
main()

{

  int i = -1;

  unsigned int u = (unsigned int)i;
  printf("%d, %u\n", i, u);

  printf("%u, %d\n", i, u);

  printf("UINT_MAX=%u\n", UINT_MAX);

}

/* size.c */
main()

{

  short s =0;

  int i = 0;

  long long x = 0;
  printf("sizeof 0 = %d\n", sizeof(0));

  printf("sizeof s = %d\n", sizeof(s));

  printf("sizeof i = %d\n", sizeof(i));

  printf("sizeof x = %d\n", sizeof(x));

}