错误代码是 12，这表示无更多内存可用。

The error code is 12, which means no more memory.

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否则，如果有符号整型可以表示无符号整型的值时，公共类型是有符号类型。

Otherwise, if the signed integer type can represent all of the values of the unsigned type, the common type is the signed type.

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云状图像常被用来表示无固定形状的、不清晰但又必须包含在图表中的一些内容。

The cloud image indicated something amorphous, intangible, but still necessary to include in the diagram.

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