Software test interview question: suppose there is a text box that requires the input of a 10 character postal code, how should the text box be divided into equivalent classes?

Suppose there is a text box asking for 10 A four character zip code , How to divide the text box into equivalent classes ？

Special characters , Such as 10 individual * or ￥; English letter , Such as ABCDefghik; Less than ten characters , Such as 123; More than ten characters , Such as 11111111111; Numbers and other mixtures , Such as 123AAAAAAA; Null character ; Reserved characters

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