Logical AND is defined as being true if and only if both of its predicates are true, otherwise it is false. So both A and B must be true for A AND B to be true. Look at the table below -
A |
B |
A && B |
| F | F | F |
| F | T | F |
| T | F | F |
| T | T | T |
This is known as a truth table. It shows all of the possible states that A and B can be in. As you can see both A and B must be true for A && B to be true. Let us look at a concrete example. Remember the example on retaking exams?
We did it last time with a nested if. We could of done it with conjunction -
Next we will look at OR and NOT as well as how to do XOR :)