Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 3 - No. 22)
What is the purpose of a 'presence check' in data validation?
To make sure the user has entered a password
To check if data has been entered in a field.
To see the data type is correct
To see if the data is valid
Giải thích
A presence check ensures a user has entered data into a required field.