CODEWITHSUNDEEP
javascriptbit-manipulationbitwise-operators
LVA
LVA

Reputation: 103

bitwise OR unexpected result

This line of code:

console.log((90000000000000|0).toString());

output:

-1039687680  ( bin -111101111110000110000000000000 )

According to 32-bit signed integer conversion, I expect:

/--discarded--\/---------significant----------\
10100011101101011000010000001111010000000000000    = 90000000000000
                              │
               11000010000001111010000000000000 OR
               00000000000000000000000000000000
               ================================
               11000010000001111010000000000000    = -1107795968
           sign/\------significant bits-------/

Why I obtain -1039687680 instead of -1107795968?

Upvotes: 1

Views: 56

Answers (1)

J.Cheong
J.Cheong

Reputation: 227

As mentioned in post you linked, it's in two's complement format.

negative 11000010000001111010000000000000 xor 1 plus 1 equals

positive 11110111111000011000000000000000, 1039687680

finally -1039687680 gained.

Upvotes: 1

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