In programming languages, the transformation between values which represent the same data item but belong to different data types. Note: information may be lost due to conversion since accuracy of data representation varies among different data types.

• 在编程语言中，表示相同数据项但属于不同数据类型的值的变换。注：转换可能会损失信息，因为对于不同的数据类型其数据表示的精度不同。