May/June 2026 Paper 32

2026 · 11 questions · 26 parts · 75 marks

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3(a)Floating Point Numbers Rounding ErrorsMedium3 marks
Numbers are stored in a computer system using binary floating-point representation with:
  • 12 bits for the mantissa
  • 4 bits for the exponent
  • two’s complement form for both the mantissa and the exponent.
Calculate the denary value of the given normalised binary floating-point number. Show your working.
FieldBits
mantissa (12 bits)1 0 1 1 0 1 0 0 0 1 1 0
exponent (4 bits)0 1 1 0
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3(b)Floating Point Numbers Rounding ErrorsMedium2 marks
Describe one example of a situation that could cause underflow to occur and the consequences of this underflow.

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