itab = VALUE #( FOR j = 1 WHILE j <= 100 ( j ) ). * Reduce 后面跟類型 * A constructor expression with the reduction operator * REDUCE creates a result of a data type specified using type * from one or more iteration expressions. * At least one variable or one field symbol must be specified. The variables or field symbols declared after * INIT can only be used after NEXT. * At least one iteration expression must then be specified using FOR and it is also possible to specify multiple * consecutive iteration expressions. DATA(sum) = REDUCE i( INIT x = 0 FOR wa IN itab NEXT x = x + wa ). WRITE: / sum.

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