What is the difference between when a single equals sign is used and a double equals sign is used?

Question

What is the difference between when a single equals sign is used and a double equals sign is used?

Group of answer choices:

A single equals sign is used for integers whereas a double equals sign is used for floats.

A single equals sign means assignment whereas a double equals sign means a conditional expression.

A single equals sign is used for floats whereas a double equals sign is used for integers.

A single equals sign is means that the variable holds a shorter value whereas a double equals sign means that the variable holds a longer value.

Which one ?

Answer 1

A single equals sign indicates assignment. For example,

x = 3

will assign the value 3 to the variable x.

Meanwhile, a double equals sign indicates a conditional expression, or an expression that evaluates to a boolean value (true/false). So, if we've assigned 3 to the value x as above,

x == 3

will evaluate to true. You can use the double equals sign in things like if statements:

if (x == 3) {

System.out.println("Confirmed that x is assigned to 3");

}

(examples in Java)