And / Or

Question

Are these sentences correct? What does it mean when I use 'or' and what does it mean when I use 'and' ?

1. One of the options –f and –c has to be specified

2. One of the options –f or –c has to be specified

3. If you need to display more lines on either side, then use the -A and -B options. (Does 'either' mean 'one or the other' or 'one and the other'?)

4. If you need to display more lines on either side, then use the -A or -B option.

Thanks

CalifJim · Accepted Answer

If only one option is to be specified, then it is -f (that has to be specified) or -c (that has to be specified).

If ... more lines on either side
means
If ... more lines on one side or if ... more lines on the other side.

If both -A and -B must be used, say -A and -B.
If -A can be used or -B can be used (with the same effect), say -A or -B.

CJ

Emagdoub · Answer

*(Questions 1 &2)One of the Options F OR C has to be specified. (only one option , so it's either f or c)

*(Questions 3&4) Q.3Either here means on both sides.

Either can mean both and each ~~which is the more usual use~~ one and

the other of TWO .

Ex. : There was an armchair at either end of the table.

While Either can be used to mean any or any of when the number is greater than TWO& one or the other (of Two) :

EX.: In either of these events you will benefit.

Accordingly:

The answer to question 3 would be ONE and the Other while the answer to question 4 will be one or the other.

And / Or

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