Two AND Operators

An expression with two && operators works like you expect. But let us look at the situation in detail. When the && operator is used twice in an expression, group the first && and its operands together like this:

  (4 < 8 ) && (12 <= 40 )  && (50 > 1)

     is equivalent to:

( (4 < 8 ) && (12 <= 40 )) && (50 > 1)

Now evaluate that first group. The result is a true or false that is used with the next && operator:

(          true          ) && (50 > 1)

The effect of this is that for the entire expression to be true, every operand must be true. One or more false values cause the entire expression to be false.

Short-circuit evaluation is still going on, so the first false value stops evaluation and causes the entire expression to be false.