undefined

Example:In this code, the variable should be declared with an undefined constant until its value is known.

Definition:A constant for which no specific value or meaning has been assigned.

Example:The compiler may optimize the undefined behavior in different ways, leading to unpredictable results.

Definition:Behavior whose behavior is not specified in the language standard, and which can result in unpredictable outcomes.

Example:Using an undefined function can result in a runtime error or undefined behavior in the program.

Definition:A function that has not been declared or implemented and thus does not have a defined value or behavior.

Example:The error message states that there is an undefined reference to a required library function.

Definition:An error message from a compiler or linker indicating that a symbol (such as a function or variable) is not defined in the program or libraries being linked.

Example:In advanced mathematics, the term 'undefined' is used to describe operations like division by zero.

Definition:A term or operation for which no specific value or meaning has been defined.