How Does Array Initialization Fill Arrays with Zeros in C and C ?

How Array Initialization Fills Arrays with Zeros

The initialization of arrays like char array[100] = {0} employs a straightforward mechanism rather than any arcane magic.

In C, according to section 6.7.8.21 of the C specification, the compiler assigns pointers to NULL and arithmetic types to zero for undefined array elements. This process applies recursively to aggregates.

In C , section 8.5.1.7 of the C specification dictates that the compiler aggregate-initializes undefined array elements.

Moreover, C provides an empty initializer list option, char array[100] = {}, which triggers aggregate initialization for all array elements.

To gain insights into the code generated by the compiler in such situations, refer to the discussion in the question "Strange assembly from array 0-initialization."

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