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Home/ Questions/Q 270715
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T00:02:47+00:00 2026-05-12T00:02:47+00:00

I am wondering why the following two types struct { double re[2]; }; and

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I am wondering why the following two types

struct {
    double re[2];
};

and

double re[2];

have the same size in C? Doesn’t struct add a bit of size overhead?

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  1. Editorial Team
    Editorial Team
    2026-05-12T00:02:48+00:00Added an answer on May 12, 2026 at 12:02 am

    No, it just merely composes all the elements into one higher-level element whose size is merely the individual elements’ sizes added up (plus some padding depending on alignment rules, but that’s out of the scope of this question).

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