Dereferencing a null pointer value is undefined, often resulting in a segmentation fault. Unspecified behavior is different from undefined behavior. If the program attempts to access an uninitialized value, the results are undefined. Apparently codice 24 (undefined) and codice 25 (defined but not referenced) should be identical. These concepts are undefined for empty or unbounded intervals. An important distinction between growth media types is that of defined versus undefined media. As with relative change, the relative difference is undefined if is zero. Otherwise, "g"("i") is undefined. In some programming languages, an attempt to divide by zero results in undefined behavior. Whenever this happens, the above expression is undefined because it involves division by zero. Moreover, compilers are not required to diagnose code that relies on undefined behavior. The value of codice 8 is undefined. Under some circumstances there can be specific restrictions on undefined behavior. Boole kept the result as something undefined. Performing standard arithmetic operations with the symbols formula 25 is undefined.