Question

12. What is unsized array ?​

Answer 1

Answer:

If unsized arrays are declared, the C compiler automatically creates an array big enough to hold all the initializers. This is called an unsized array.

Answer 2

Answer:

Array initialization without size means that the size of the array is skipped in the initialization statement. C++ then automatically creates an array large enough to hold any initializers present and calculates the dimensions of the array without size.

• You can use unsized arrays to automatically size arrays in C++.

• If the size of the array is not specified in the array initializer statement, C++ automatically creates an array large enough to hold all the initializers present.

• A sizeless array initialization method allows you to change the message without changing the size of the array.

• This avoids errors caused by miscounting the number of characters in the message.

• Sizeless array initializers are not limited to one-dimensional arrays.

• For multidimensional arrays, all but the leftmost dimension must be specified for C++ to index the array properly.
• A sizeless array initializer allows you to create tables of varying lengths and the compiler automatically allocates enough space for the table.
• The advantage of this declaration over the customized version is that the table can be made longer or shorter without changing the dimensions of the array.

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