Integer, real, Boolean, character and string, choosing the right type for a phone number, a price or a grade, and why 7 + 3 and '7' + '3' give different results.

What you need to know

Answer each one before you reveal it.

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Key term

What is a data type?

Key term

What is the integer data type?

Key term

What is the real data type?

Questions from this subtopic

Each one with the model answer underneath.

1
What is a data type?
Model answer
A data type sets the kind of value a variable can hold. The data type also decides which operations can be carried out on that value.
2
What is the integer data type?
Model answer
An integer is a whole number with no fractional part. Integers can be positive, negative or zero, such as 42, 0 and −7.
3
What is the real data type?
Model answer
A real is a number that can have a fractional part, such as 3.75 or −0.5. Some languages call a real a float.
4
What is the Boolean data type?
Model answer
A Boolean holds only one of two values, True or False. Booleans are used in conditions and to record whether something has happened.
5
What is the character data type?
Model answer
A character is a single letter, digit, symbol or space. Examples of characters are 'A', '7' and '#'.
6
What is the string data type?
Model answer
A string is a sequence of characters, such as a name or a sentence. A string can also be empty, holding no characters at all.

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