Question

我是使用Z3的新手。我一直试图解决Z3的问题，但我不能。我有一个像这样的c / c ++代码：

n5

for i in range(1,8): globals()['j%i' % i] = BitVec ('j%i' % i, 8) s = Solver() a = IntVector('a', 5) a__1 = If(eq(j1, j6), 0, 1) a__2 = If(j1+1 != j2, 1, 0) a__3 = If(j4+1 != j1,1, 0) a__4 = If(j3+4 != j6,1, 0) a__5 = If(j5+2 != j3, 1,0) su = IntVector('su',1) su = Sum(a) z= Real('z') s.add(z == j4**102) s.add(su + z + j7 > 0) while s.check() == sat: print s.model()变量必须大于零。我编写的Z3py代码如下代码所示：

TypeError: unsupported operand type(s) for ** or pow(): 'instance' and 'int'

运行脚本后我收到了这个错误：

SELECT (CASE WHEN (
                    SELECT COUNT(*)
                    FROM mlm_register r2
                    WHERE r2.dsponserid = 10001 AND
                          r2.joindate BETWEEN '2018-02-13' AND DATE_ADD('2018-02-13', INTERVAL 7 DAY)
                  ) >= 5
             THEN 200
             WHEN r.dsponserid = 10001 AND
                  r.joindate BETWEEN '2018-02-13' AND DATE_ADD('2018-02-13', INTERVAL 7 DAY)
             THEN 0
             ELSE 0
      END) AS MONEY
FROM mlm_register r

提前致谢。

Answer 1

我不确定你的实际问题是什么，但我想我会按照我理解的方式翻译C（++）代码。我避开了IntVector，但使用了Int来创建Sum。

我想出了下面的代码它打印模型，我希望它可以帮助你。

# import all of z3, because why not; define solver
from z3 import *
s = Solver()

# define j
for i in range(1,8):
    globals()['j%i' % i] = BitVec ('j%i' % i, 8)

# define 8-bit BitVector (BV) (not Integer in the mathematical sense)
n4 = BitVec('n4', 8)

# create an Int so we can use Sum (we could also create BV for each if and then sum directly)
su = Int("sum")
s.add(su == Sum(
            If(eq(j1, j6), 0, 1),
            If(j1+1 != j2, 1, 0),
            If(j4+1 != j1, 1, 0),
            If(j3+4 != j6, 1, 0),
            If(j5+2 != j3, 1, 0)
            )
     )
# we used an int, so we need to convert to a BV
s.add(n4 == Int2BV(su, 8))

# create n5 as an 8-bit BV and make sure it's value matches the formula
n5 = BitVec('n5', 8)
s.add(n5 == (n4 + (j4 ^ 102) + j7))  # I assume you meant ^ and not **
# requirement, n5 > 0 (could be merged with the lines above, avoiding the creation of n5 BV)
s.add(n5 > 0)

# iterate over solutions
while s.check() == sat:
    print(s.model())  # Python3 uses brackets

Z3py使用pow（）函数返回不支持的操作数

1 个答案: