OCR H446 · Component 01 · Computer systems
1.4.1 Data types
Variables, constants, primitive data types, casting, number bases, binary arithmetic, negative numbers, shifts, masks, units, character sets, and floating point representation.
What to revise
Practise data types.
Start with these questions from the data types topic pack. In the workspace, explain each idea from memory, compare your reasoning with the feedback, then revisit the concepts that need practice.
Use the pack alongside your OCR H446 computer systems revision. Your self-reported confidence helps plan the next review; it is not an exam mark or predicted grade.
- Represent denary 182 as an eight-bit unsigned binary integer. Show the place values used.Convert
- Represent positive denary 125 in hexadecimal, showing the quotient and remainder.Convert
- Convert binary 10110110 to hexadecimal, then verify its denary value.Convert
- Represent -19 using eight-bit sign and magnitude and eight-bit two's complement.Convert
- Add 01100100 and 00101101 as eight-bit two's-complement numbers. Is the stored result valid?Apply
- A format has a five-bit two's-complement mantissa with the binary point after the sign bit, followed by a four-bit two's-complement exponent. Decode 10100 0011.Convert
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