CODEWITHSUNDEEP
java
lknockoutl
lknockoutl

Reputation: 11

Variable Assignment plus an extra

boolean []r = new boolean[numberOfStates];
for(int i=0; i<numberOfStates;i++)
    r[i]=i==q;

Being q, i and numberOfStates int variables, what does r[i]=i==q; do?

Upvotes: 1

Views: 61

Answers (3)

Shekhar Khairnar
Shekhar Khairnar

Reputation: 2691

if you initialize array as and q as bellow you will end up with result

true false

    public static void main(String[] args) {
        int numberOfStates = 2;
        int q = 0;
        boolean []r = new boolean[numberOfStates];
        r[0] = false;
        r[1] = false;
        for(int i=0; i<numberOfStates;i++)
            r[i]=i==q;

        for(int i=0; i<numberOfStates;i++)
            System.out.println(r[i]);

    }

as per my understanding == has higher Precedence than = so r[i]=i==q; will evaluated as i==q (q is 0) it result true ans assigned to r[[0]] to true;

Upvotes: 0

Eran
Eran

Reputation: 394146

It assigns true to r[i] if i==q and false if not.

Which means r[q] is the only element in the array that would be assigned true.

Since all the values of a boolean array are initialized to false, you can replace this code snippet with :

boolean [] r = new boolean[numberOfStates];
r[q] = true;

Upvotes: 2

Predrag Maric
Predrag Maric

Reputation: 24433

i==q resolves to a boolean, and is assigned as value to r[i].

Upvotes: 3

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