IGCSE - Algorithms Revision

What is an automatic computer check to make sure data entered is sensible and reasonable known as?

• Double entry
• Verification
• Validation

What validation type would make sure a post code was entered in the expected way?

• Length check

• Format check

• Presence check

What validation type would you use to check that numbers fall within a certain range?

• Range check

• Presence check

• Check digit

• Format check

What validation type checks a minimum number of characters have been entered?

• Length check
• Format check
• Range check

Which of the following statements is false?

• Validation can check that the data is sensible
• Validation can check that the data falls between certain allowable boundaries
• Validation can check that the data is correct

Which of the following is NOT a method of verification?

• Double entry - typing the data in twice and getting the computer to check the second version against the first
• Using presence, range and length checks to make sure that no mistakes happen
• Printing out what you have typed in and comparing it against the source data

A boolean is...

• A whole number

• A number with a decimal part

• Letters, numbers or punctuation

• True or False

A real is...

• A whole number

• A number with a decimal part

• Letters, numbers or punctuation

• True or False

An integer is...

• A whole number

• A number with a decimal part

• Letters, numbers or punctuation

• True or False

A string is...

• A whole number

• A number with a decimal part

• Letters, numbers or punctuation

• True or False