vrp-6.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 34 行

#include <limits.h>

extern void exit (int);
extern void abort ();

void test01(unsigned int a, unsigned int b)
{
  if (a < 5)
    abort();
  if (b < 5)
    abort();
  if (a - b != 5)
    abort();
}

void test02(unsigned int a, unsigned int b)
{
  if (a >= 12)
    if (b > 15)
      if (a - b < UINT_MAX - 15U)
	abort ();
}

int main(int argc, char *argv[])
{
  unsigned x = 0x80000000;
  test01(x + 5, x);
  test02(14, 16);
  exit (0);
}