Is less than or equal to 0, evaluates to infinity or is not a valid number.

小于或等于0、计算结果为无限大或者不是有效数字。

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It ensures that the user enters a valid number and provides features such as automatic formatting.

它确保用户输入一个有效的数字，并提供功能，如自动格式化。

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Make sure a valid number is entered for each screen coordinate, and then apply the new screen coordinates.

确保为每一屏幕坐标输入有效数字，然后应用新的屏幕坐标。

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If a counterfeiter managed to get a hold of a valid ID number, Pfizer's Bond notes, they would still be unlikely to match it with the correct expiration date.

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Applicants must speak English, have a valid social security number, and an iPhone or Android device.

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Consumers using one of the Web sites were asked to provide personal information and a valid credit card number to get a copy of their credit report.

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