What causes the discrepancy in return values when using the & operator in JavaScript versus C#?

After running the same process in both JavaScript and C# using the & operator, I noticed that the result was different in each case.

C# Code

Int64 x = (634586400000000000 & 4611686018427387903);
x= 634586400000000000;

JavaScript Code

var x = (634586400000000000 & 4611686018427387903);
x= 0;

Have any insights on this discrepancy?

Answer №1

When it comes to bitwise operators in JavaScript, they perform conversions on the operands turning them into signed 32-bit integers instead of using the native IEEE 754 floats where numbers are stored.

Answer №2

Seems like you've encountered a situation where you're surpassing JavaScript's maximum integer value. According to the specifications, JavaScript integers have a maximum supported value of 2^53.

UPDATE:

Upon further examination, it appears that the issue is not related to JavaScript's max integer value, but rather the maximum value of each operand processed by the ampersand operator:

var biggest = 4294967291; // represents the maximum 32-bit unsigned integer
alert(biggest & 1); // displays 1
alert((biggest + 1) & 1); // displays 0

Keep coding!

Cheers!

Answer №3

When it comes to bitwise operators, they typically handle up to 32 bits of data. It remains unclear how these operators would behave when presented with values exceeding this limit.

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