Digital Electronics
Most of the digital computers do not have floating point hardware because

It is slower than software
Floating point hardware is costly
It is not possible to perform floating point addition by hardware
Of no specific reason

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0
0 any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.

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