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According to the WG14 Document \[1\]:

Given an integer expression E, the derived type T of E is determined as follows:

• if E is a sizeof expression, then T is the type of the operand of the expression;

• otherwise, if E is an integer identifier, then T is the derived type of the expression last used to store a value in E;

• otherwise, if the derived type of each of E's subexpressions is the same, then T is that type;

• otherwise, the derived type is an unspecified character type compatible with any of char, signed char, and unsigned char.

Example:      int val;

                     {{int arr \[ARR_SIZE\];}}

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