Explain two uses of a system documentation in system development.
Uses of system documentation
Distinguish between an assembler and an interpreter as used in programming.
Describe the octal number system.
(a) Describe the octal number system.
(b) Convert each of the following to the number system indicated:
(i) 111.1012 to decimal;
(ii) 14.687510 to binary.
(c) Convert the number -17 10 into 8-bit:
(i) signed magnitude representation;
(ii) two’s complement.
(d) Perform the arithmetic operation
110.112 + 11.0112
(a) Characteristics of octal number system.
With the aid of a diagram. describe time sharing mode as used in computer data processing.
(b) A company’s management has opted to use computers to process data. State four factors that the management needs to consider when selecting the company data processing mode.
(c) Explain the purpose of each of the following in system documentation:
(î) user manual;
(ii) sample data:
(iii) table descriptions.
(a) Time-sharing mode
This is a processing mode in which a central processor serves two or more users with different requirements. The processor time is divided equally
among the tasks in the queue. A user whose task requirements are more than is apportioned is send back to the queue. For example, four jobs requiring times t1, t2, t3 and t4 to complete is apportioned equal time in each round until when they are done.
(b) Factors to consider when selecting data processing mode
State two advantages of using low level programming languages.
(b) Other than flowcharts, state three tools that can be used to present an algorithm.