CODEWITHSUNDEEP
algorithmlogicbit-manipulation
Just a learner
Just a learner

Reputation: 28592

Four variables, how to quickly check all of them are either 1 or 0?

I have four integer variables a, b, c and d. I want to know if all of them are of values 1 or 0. Apparently I can use if statement to check this like:

if((a == 0 || a == 1) && (b == 0 || b == 1) &&
   (c == 0 || c == 1) && (d == 0 || d == 1))
{
    print(true)
}
else
{
    print(false)
}

It's just a bit boring to write all of that. I'm thinking if there are any methods to use bit operations to solve my issue. But for now I don't have any clue about it. Anyone can point me to the right direction? Or is there any other simpler way to check that?

Upvotes: 0

Views: 69

Answers (3)

olegarch
olegarch

Reputation: 3891

You can use this:

return (unsigned int)(a | b | c | d) <= 1;

Upvotes: 0

amit
amit

Reputation: 178461

One approach is to query for max and min value of these variables, and verify the min value is 0/1 and max value is 0/1. Max and Min are supported in SQL.

Upvotes: 1

dmuir
dmuir

Reputation: 4431

In C, take the bitwise or, and test that:

int e = a|b|c|d;
return e==0 || e==1;

Upvotes: 2

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