THINK++ — Engineering Visualized

Boolean Logic

Logical Operators

Logical operators combine boolean expressions. They enable complex decision-making in control flow statements.

&&AND

Both conditions must be true

T&&T=TT&&F=FF&&T=FF&&F=F

||OR

At least one must be true

T||T=TT||F=TF||T=TF||F=F

!NOT

Inverts the boolean value

!T=F!F=T

SHORT-CIRCUIT EVALUATION

// && stops at first false
// || stops at first true
if (ptr != NULL && ptr->val > 0)

The second condition is only evaluated if the first doesn't determine the result. This prevents null pointer crashes.

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