Why doesn't C have binary literals?

I am frequently wishing I could do something like this in c: ``` val1 &= 0b00001111; //clear high nibble val2 |= 0b01000000; //set bit 7 val3 &= ~0b00010000; //clear bit 5 ``` Having this syntax seems like an incredibly useful addition to C with no downsides that I can think of, and it seems like a natural thing for a low level language where bit-twiddling is fairly common. Edit: I'm seeing some other great alternatives but they all fall apart when there is a more complex mask. For example, if `reg` is a register that controls I/O pins on a microcontroller, and I want to set pins 2, 3, and 7 high at the same time I could write `reg = 0x46;` but I had to spend 10 seconds thinking about it (and I'll likely have to spend 10 seconds again every time I read those code after a not looking at it for a day or two) or I could write `reg = (1 << 1) | (1 << 2) | (1 << 6);` but personally I think that is way less clear than just writing `reg = 0b01000110;' I can agree that it doesn't scale well beyond 8 bit or maybe 16 bit architectures though. Not that I've ever needed to make a 32 bit mask.