Possible to initialize an array after the declaration in C?

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You cannot assign to arrays so basically you cannot do what you propose but in C99 you can do this:

CGFloat *components;
components = (CGFloat [8]) {
    0.0, 0.0, 0.0, 0.0,
    0.0, 0.0, 0.0, 0.15
};

the ( ){ } operator is called the compound literal operator. It is a C99 feature.

Note that in this example components is declared as a pointer and not as an array.

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