Y13 Autumn1 1.4.1 & 2.2.1

Convert the hexadecimal value B7E to a binary number

(a)  

110010101 is a binary number that is represented using sign and magnitude.

Convert this binary number to a denary number. The answer should begin with the minus '-' symbol

(a)  

Complete this binary subtraction. Both numbers are 8-bit integer values represented using two’s complement.

Show the result in the same format

0110 1101 -

0011 0100

(a)  

The normalised floating point number 1010 1110 is stored using 4 bits for the mantissa and 4 bits for the exponent, both in two’s complement.

Give the denary version of this number the answer should begin with the minus '-' symbol

(a)  

The following floating point numbers re stored using 6 bits for the mantissa and 3 bits for the exponent, both in two’s complement. Sort them !

Groups:

(a) Normalised

,

(b) Not normalised

• 011010 010

• 110101 111

• 010101 100

• 101010 110

A programmer creates this function shown in image using a high-level language

State the value output by the line print(mystery(10,20))

(a)  

A programmer creates this function shown in image using a high-level language

State the value output by the line print(mystery(0,70))

(a)  

A programmer creates this function shown in image using a high-level language

State the value output by the line print(mystery(45,55))

(a)  

Before the code in image can be executed, a translator must be used.

2. State the purpose of a translator.

4. Pick the winning answer.
   

• Translated code into something the computer could understand

• • To convert (high-level or assembly) code to low level/machine code

• Making the program executable

• • To convert code to make it executable

1. Identify two differences between a compiler and an interpreter.

3. 
   

• • Compiler translates code all at once/before it’s executed

• • Interpreter stops at the first error

• • Interpreted programs have the source code hidden

• • Compiler stops at the first error