This is because a composite value type, such as a user-defined structure, has no valid default value.

这是因为复合实值型别(例如使用者定义的结构)没有任何有效的预设值。

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A second kind of operator is one that ACTS on component data elements instead of on the entire composite value.

第二种操作符是针对组成数据元素而非整个复合值的一种操作。

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By the final low in October 1974, the NYSE Composite had lost over half its value.

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At one point in the early afternoon in New York, the Nasdaq composite index - which reflects the value of tech firms - was down nearly 7% on the day, and had plunged to just half its value from from the high point of 5, 048.6 it reached on 10 March.

BBC: Tech shares battered on Wall Street

The ranking measures a composite of sales, profits, assets and market value.

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