C Question
logical AND and OR in c
In a && b , this returns true if both a and b are equal to 1. If a=-1 and b=-1 then also the expression returns true.Similar is the case with a||b,where a=-1 and b=0,it returns true. Can anybody please explain the reason.
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Answer Source
a && b returns 1 when both a and b are nonzero, not just when they're equal to 1. Otherwise it returns 0.
a || b returns 1 when at least one of a or b is nonzero, not just when one of them is equal to 1. Otherwise it returns 0.
To give some examples:
0 && 0 -> 0
1 && 0 -> 0
1 && 1 -> 1
2 && 1 -> 1
-1 && -1 -> 1
-100 && 0 -> 0
0 || 0 -> 0
1 || 0 -> 1
0 || 1 -> 1
-1 || 0 -> 1
-100 || 20 -> 1
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