Question

I have been asked

Given the definitions of a, b and c below, select the expressions that compile successfully and evaluate to true.

int a = 1;
char b = 'a';
boolean c = false;

So I used a simple

if (expression)
{System.out.println("True");}
else
{System.out.println("False");}

Is this right?

c==a         //false
!c || a      //false
b >= a       //true
c = a        //false
a - b - 96   //false
a + b > 0    //true
c = true     //true
a < b        //true

Does this look ok?

Answer 1

• c==a: doesn’t compile, int can’t be compared to boolean.
• !c || a: doesn’t compile, boolean || int isn’t allowed
• b >= a: compiles, evaluates to true
• c = a: doesn’t compile, can’t assign an int value to a boolean
• a - b - 96: compiles, evaluates to -192
• a + b > 0: compiles, evaluates to true
• c = true: compiles, evaluates to true (and assigns true to c)
• a < b: compiles, evaluates to true