Mathematical expression computation bug

[button-chen]

Mathematical expression：
(((2871 * 7446 + (4929 - 3435)) / ((754 * 5717) + (13 * 964))) - (6940 * 2554 * 8394 * 6115 * (811 * 4990 * (4305 + 6293))) - (2399 + 2562 + (8560 / 7616) / (2106 * 3816) / (4516 / 9112) - ((4153 * 5871) / 7072 - 6863) * (3101 + 2727 - (4537 * 3626))))

Correct result： -3.90203449761652E+25

anko result： -2.5772796100513167e+18

[button-chen]

You can use python validation：

[mattn]

This is different between static typed literal and dynamic typed literal.

See https://go.dev/play/p/FDAs2CW-Arf

[button-chen]

anko:
env := env.NewEnv()
v, _ := vm.Execute(env, nil, "2/3")

fmt.Println("result: ", v)

output: result: 0.6666666666666666

python:

2/3
0.6666666666666666
2//3
0

So how should anko behave ？

[mattn]

Try below in anko

println((((2871.0*7446.0 + (4929.0 - 3435.0)) / ((754.0 * 5717.0) + (13.0 * 964.0))) - (6940.0 * 2554.0 * 8394.0 * 6115.0 * (811.0 * 4990.0 * (4305.0 + 6293.0))) - (2399.0 + 2562.0 + (8560.0/7616.0)/(2106.0*3816.0)/(4516.0/9112.0) - ((4153.0*5871.0)/7072.0-6863.0)*(3101.0+2727.0-(4537.0*3626.0)))))

[mattn]

(6940.0 * 2554 * 8394 * 6115 * 42888940220)

(6940 * 2554 * 8394 * 6115 * 42888940220)

A part of this 2554 * 8394 * 6115 * 42888940220, this become overflow in int64.

[mattn]

https://go.dev/play/p/F-t94NmgrBc

[mattn]

Python can handle large number as bignum. You need to use math/big in Go or Anko.