What are arrays used for in Delphi?
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What are arrays used for in Delphi?
Arrays allow us to refer to a series of variables by the same name and to use a number (an index) to call out individual elements in that series. Arrays have both upper and lower bounds and the elements of the array are contiguous within those bounds.
How do you create a constant array?
If you want to make an array constant, you can precede its type with the word const. When you do so, the array name is constant, and the elements inside the array are also constant. Thus you cannot have a constant array with nonconstant elements, nor can you have a nonconstant array with constant elements.
Can I push to const array?
Even though the numbers array is a const you’re able to update or change the variable. For example, you can add another number to the numbers array by using the push method. Methods are actions you perform on the array or object. const numbers = [1,2,3]; numbers.
What is a dynamic array Delphi?
As of Delphi 4, Delphi supports dynamic arrays. You can modify their sizes at run time and they will retain the data you stored in other elements at the old size. They can hold elements of any homogeneous type, including records and other arrays.
How do you initialize an array constant in Java?
If you just want to predefine the array in your class, you can do it: private static final int[] MY_ARRAY = {10, 20, 30, 40, 50}; Here we created a predefined array MY_ARRAY of length 5, so MY_ARRAY[0] is 10 and so on.
Can constant array be changed?
The property of a const object can be change but it cannot be change to reference to the new object. The values inside the const array can be change, it can add new items to const arrays but it cannot reference to a new array.
Can you reassign an array?
Summary. In short, you cannot reassign any variables declared with const. However, unlike simple variables ie numbers, strings, and booleans, objects & arrays provided additional properties and methods that let modify their values.
How do I push into a new array?
push() The push() method adds one or more elements to the end of an array and returns the new length of the array.
How do you free an array in Delphi?
“free array Delphi 7” Code Answer
- destructor TMyInfo. Destroy;
- var.
- I: Integer;
- begin.
- for I:= Low(SubInfo) to High(SubInfo) do.
- SubInfo[I]. Free;
- SetLength(SubInfo, 0);
- inherited;
