simply checks that something (anything) has been input
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Card 7
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This check the appropriate data type (number, date, etc.) was adhered to.
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Double entry
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Check digits
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This technique will then check the final number in the sequence before the computer performs a complex calculation on all of the numbers to compare the answer to the final number. If both match, it meas data has been entered correctly.
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Card 11
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After data has been entered, the user is presented with a screen showing the entered data, offering a chance to visually check and correct any errors.
