It's hard to count the number of ! and ¡ and impossible to decide dynamically

[guigui0246]

You should be able to

const const const val = 3!x∞
f add(x, y) => x + y !*val
var var val = 5!x∞ // Error
var var d = 1!x-∞
print(d) // Error d doesn't exist
d = Infinity
const const e = 0¡x-d
print(e)

[guigui0246]

Would fix #100

[guigui0246]

Notes:
x and * both work for multiplication
You can use any math expression after the multiplication factor