如何为整个数组赋值0

Question

I have an array. int[] array = new int[10]; . I want to assign '0' to whole array without using loop means that 0 is to be stored in all of the indexes. How would i do it.

Answer 1

After creation all items of array will have default values, which is 0 for int. So, you don't need to do anything here.

From Arrays (C# Programming Guide) :

The default values of numeric array elements are set to zero, and reference elements are set to null.

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Also from C# Specification 12.2 Array creation

Elements of arrays created by array-creation-expressions are always initialized to their default value.

5.2 Default values

For a variable of a value-type, the default value is the same as the value computed by the value-type's default constructor

4.1.2 Default constructors

For sbyte, byte, short, ushort, int, uint, long, and ulong, the default value is 0.

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but after assigning other values i want all the indexes to be 0 again so then how would i do it?

UPDATE: You can use Array.Clear :

Sets a range of elements in the Array to zero, to false, or to null, depending on the element type.

In your case:

Array.Clear(array, 0, array.Length);

Consider also to use List<int> instead of array - it allows to add/remove items dynamically.

Answer 2

You don't need to do anything at all.

Since int is a value type , all elements are initilialized to 0 as a default.

From Arrays (C# Programming Guide)

The default values of numeric array elements are set to zero, and reference elements are set to null.

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ok if i want it to be assigned to 3 then how would i do it?

You can use for loop to assign them like;

int[] array = new int[10];
for(int i = 0; i < array.Length; i++)
    array[i] = 3;

If you want to give back their default values (which is 0 in this case), you can create a new array or you can use Array.Clear method like;

Array.Clear(array, 0, array.Length);

If you really don't want to use any loop, you might need to use List<int> instead an array. It has more functionality and it creates a clean list (without any default value).