Question

when i pass n = 0x0, i get 0xffffffff on the screen
which i expect should be 0x00000000
as i shift the word by 32 bits
(Just Ignore the x! I didn’t use it inside the function.)

void logicalShift(int x, int n) {
    int y = 32;
    int mask = 0xffffffff;
    printf("mask %x", mask << (y-n));
}

One of the interesting point is

void logicalShift(int x, int n) {
    int y = 32;
    int mask = 0xffffffff;
    printf("mask %x", mask << 32);
}

this will output what i expected. Do i miss out anything?
Thank you!

Im running on ubuntu

Answer 1

A shift left of 32 bits on a 32 bit value has undefined results. You can only shift 0 to 31 bits.

See also here: Why doesn't left bit-shift, "<<", for 32-bit integers work as expected when used more than 32 times?