Menu
I am trying to take one's complement of 0 to get 1 but I get 4294967295. Here is what I have done:
unsigned int x = 0;
unsigned int y= ~x;
cout << y;
My output is 4294967295 but I expect 1, why is this so? By the way, I am doing this in C++.
218
Bitwise NOT (~) The 32-bit signed integer operand is inverted according to two's complement. That is, the presence of the most significant bit is used to express negative integers. Bitwise NOTing any number x yields -(x + 1) . For example, ~-5 yields 4 .
Bitwise NOT (or complement) is a Bitwise operation, is a unary operation that performs logical negation on each bit, forming the ones' complement of the given binary value. Bits that are 0 become 1, and those that are 1 become 0. Bitwise NOT is equal to the two's complement of the value minus one.
The ~ (bitwise negation) operator yields the bitwise complement of the operand. In the binary representation of the result, every bit has the opposite value of the same bit in the binary representation of the operand.
Why do you expect 1? Bit-wise complement flips all the bits.
00000000000000000000000000000000 = 0
|
bitwise NOT
|
v
11111111111111111111111111111111 = 4294967295
Perhaps you are thinking of a logical NOT. In C++ this is written as !x.
56
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
