For example: int a.

Subscript can be a constant.

i=8，j=9 .

A[i+j] can also be used, and the subscript i+j is a plastic expression.

An element in an array is referenced by an array subscript, for example, a( 10), where 10 is an array subscript. Some arrays have subscripts that start with 0, so to refer to the first element, use a 0 subscript, such as a(0).

Extended data:

The assignment of expression is related to the definition of operator and the domain of numerical value. If the two expressions are equivalent, that is to say, for any fixed value of free variables, the outputs of the two expressions are the same, that is, they represent the same function.

The expression must be well-formed. Each operator must have the right number of inputs in the right place. For example, expression 2+3 is a combination; However, the expression *2+ is not grammatical, at least not a general representation of arithmetic.

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