How java converts int to boolean

Question

When i convert:

int B=1;
boolean A=B;

It gives error: Incompatible types, which is true

But when I write this code:

int C=0;
boolean A=C==1;

it gives false while if I change value of C to 1 it gives true. I don't understand how compiler is doing it.

Uma Kanth · Accepted Answer · 2015-07-09 05:56:37Z

4

int C=0;
boolean A=C==1;

The compiler first gives C a zero.

Variable : C
Value    : 0

Now The Assignment statement,

We know that the assignment statement evaluates the right part first and the gives it to the left.

The right part ==> C == 1 Here, This is an expression which evaluates to true or false. In this case it is false as c is 0.

So the R.H.S is false.

Now this gets assigned to the L.H.S which is A.

A = ( C == 1 ) ==> A = false

As A is a boolean this is a right statement

answered Jul 9, 2015 at 5:47

Uma Kanth

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Comments

Eran · Accepted Answer · 2015-07-09 05:32:15Z

4

C==1 is an expression whose result is boolean (it's the comparison operator). It returns true if C equals to 1 and false otherwise.

Therefore boolean A=C==1; is a valid assignment of a boolean value to a boolean variable.

answered Jul 9, 2015 at 5:32

Eran

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Jayaram · Accepted Answer · 2015-07-09 05:32:46Z

2

It checks c==1 first and result getting assigned to A.

as C is not 1 so expression value is resulting to false which is assigned to A

answered Jul 9, 2015 at 5:32

Jayaram

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