Revision as of 11:52, 14 January 2012 (view source) rosettacode>Ledrug (→‎{{header\|Matlab}} / {{header\|Octave}}: fix header) ← Older edit		Revision as of 22:42, 25 April 2012 (view source) rosettacode>Bearophile (Updated D entry) Newer edit →
Line 173: =={{header\|D}}== In D variables are initialized either with an explicit Initializer or are set to the default value for the type of the variable. If the Initializer is void, however, the variable is not initialized. If its value is used before it is set, undefined program behavior will result. "void" initializers can be used to avoid the overhead of default initialization in performance critical code. <lang d>//void ~~initialized~~main() { // Initialized: ~~int a = 5;~~ ~~double~~ b int a = 5.0; ~~char~~ c double b = ~~'f'~~5.0; char c = 'f'; int[] d = [1, 2, 3]; // ~~default~~Default initialized: int aa; // set to 0 double bb; // set to double.~~nan~~init, that is a NaN char cc; // set to 0xFF int[] dd; // set to null int[3] ee; // set to [0, 0, 0] // Undefined (contain garbage): ~~// undefined~~ ~~int~~ ~~aaa~~ = ~~void;~~ //int ~~assert(~~aaa != 0)void; double[] bbb = void; ~~// assert(bbb !is null)~~ int[3] eee = void; ~~// contains garbage</lang>~~ }</lang> =={{header\|Delphi}}==

Undefined values (view source)