How Can I Initialize C Struct Members to Zero?
Dec 08, 2024 am 10:08 AMDefault Initialization of C Struct Members
In a C struct, members are not automatically initialized to 0 by default. To initialize struct members to 0, there are several options:
Value Initialization
Using brace-enclosed empty braces { } assigns default values to all members:
Snapshot s = {};
Parent Struct Recursion
If a parent struct contains a sub-struct, value initialization of the parent struct will also initialize its sub-struct members to 0:
struct Parent { Snapshot s; }; Parent p = {}; // p.s.{x,y} will be zero
Constructor Initialization
If the struct has a constructor, members can be initialized in its parameter list:
struct Snapshot { int x; double y; Snapshot():x(0),y(0) { } }; Snapshot s; // s.{x,y} will be zero
Value Initialization Using ()
Value initialization, indicated by (), initializes members regardless of their type:
struct Snapshot { int x; double y; }; Snapshot s = {x(), y()}; // s.{x,y} will be zero
Note that value initialization is important for template structs, ensuring proper initialization for different types.
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