Which one is a valid declaration of a boolean?

For Competitive Exams

10th CBSE Maths

Which one is a valid declaration of a boolean?

boolean b1 = 1;

boolean b2 = ‘false’;

boolean b3 = false;

boolean b4 = ‘true’

Explanation:

Boolean can only be assigned true or false literals.

Next Question

What is the output of this program?
class array_output {
public static void main(String args[])
{
char array_variable [] = new char[10];
for (int i = 0; i < 10; ++i) {
array_variable[i] = i;
System.out.print(array_variable[i] + "" );
i++;
}
}
}

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