Array initialization
From cppreference.com
When initializing an object of array type, the initializer must be either a string literal (optionally enclosed in braces) or be a brace-enclosed list of initialized for array members:
= string-literal
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(1) | ||||||||
= { expression , ... }
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(2) | (until C99) | |||||||
= { designator(optional) expression , ... }
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(2) | (since C99) | |||||||
= { }
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(3) | (since C23) | |||||||
1) string literal initializer for character and wide character arrays
2) comma-separated list of constant(until C99) expressions that are initializers for array elements, optionally using array designators of the form
[ constant-expression ] = (since C99)3) empty initializer empty-initializes every element of the array
Arrays of known size and arrays of unknown size may be initialized, but not VLAs(since C99)(until C23). A VLA can only be empty-initialized.(since C23)
All array elements that are not initialized explicitly are empty-initialized.
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