pointer variable वाक्य
उदाहरण वाक्य
मोबाइल
- Extended versions of COBOL also provide pointer variables declared with USAGE IS POINTER clauses.
- The values of such pointer variables are established and modified using SET and SET ADDRESS statements.
- However, this technique will not clear other pointer variables which may contain a copy of the pointer.
- C # also allows the programmer to disable the normal type-checking and other safety features of the pointer variables.
- Thus, despite this apparent equivalence between array and pointer variables, there is still a distinction to be made between them.
- Some extended versions of COBOL also provide PROCEDURE-POINTER variables, which are capable of storing the addresses of executable code.
- Because they are typically unchecked, a pointer variable can be made to point to any arbitrary location, which can cause undesirable effects.
- As pointer variables are usually of a fixed size ( e . g ., most desktop computers have pointers 64 bits long ), and they are numeric, they can be swapped quickly using XOR swap.
- Other measures may also be taken ( such as validation & bounds checking, to verify the contents of the pointer variable contain a value that is both a valid memory address and within the numerical range that the processor is capable of addressing ).
- In appropriate contexts in source code, such as for assigning to a pointer variable, a " null pointer constant " can be written as 0, with or without explicit casting to a pointer type, or as the NULL macro defined by several standard headers.
- In 2000, Lawson was presented the Computer Pioneer Award by the IEEE [ f ] or inventing the pointer variable and introducing this concept into PL / I, thus providing for the first time, the capability to flexibly treat linked lists in a general-purpose high level language .
- Even though the name of an array is, in most expression contexts, converted into a pointer ( to its first element ), this pointer does not itself occupy any storage; the array name is not an l-value, and its address is a constant, unlike a pointer variable.
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