NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
OCTOBER 2019 EXAMINATION

COURSE CODE: CIT736
COURSE TITLE: COMPUTER PROGRAMMING
CREDIT UNIT: 2
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER QUESTION 1 AND ANY OTHER THREE QUESTIONS

1a (i) Expound on the concept of a computer program? (3 marks)
(ii) Interpret the description of a computer language being machine dependent? (3 marks)
b) Differentiate between caching and buffering programming techniques (4 marks)
c (i) Give five (5) major features of FORTRAN 90/95 (5 marks)
(ii) Declare and assign 3.142 and 7.8 to constant variables C and D in FORTRAN 90/95 (2 marks)
d (i) Declare PASCAL subrange type for the letters of the English alphabet (2 marks)
(ii) Declare PASCAL enumerated type for the days of a week (2 marks)
e) Distinguish between a function and a subroutine (4 marks)
[25 marks]

2a) Distinguish between the following terms
(i) Symbolic/ High-level languages (ii) Compilers/Interpreters (6 marks)
b) The value B of a savings account of an amount A that is deposited for n years with a yearly interest rate of r is given as: ( ) . Represent this information in a flowchart (4 marks)
c(i) Write a FORTRAN program to evaluate the expression (4 marks)
(ii) Hence, what is the value of d when a=13, b= 4.2, and c = (4b)/a (1 mark)
[15 marks]

3a) Differentiate between user-defined and pointer data types in PASCAL (5 marks)
b) (i) Propose how a PASCAL “FOR LOOP” statement should work (3 marks)
(ii) Write a PASCAL program using FOR LOOP to compute the total sales of a company for 5 days, given sales are aggregated daily. (5 marks)
c) Write a FORTRAN command to open a temporary file and make it automatically deleted when it is closed or on program termination (2 marks)
[15 marks]

4a) Describe two (2) OOP features supported by FORTRAN 90/95 (3 marks)
(b) (i) Itemize three (3) roles of FORTRAN debugger to a program (3 marks)
(ii) Write a FORTRAN program that prints the sum of 7 elements of an array using DO LOOP construct (6 marks)
c) What is the difference between PASCAL Read and ReadLn statements (3 marks)
[15 marks]

5a) Deduce the concept of a recursive procedure? (2 marks)
b) (i) Write a FORTRAN statement that defines an integer array, SAMPLE with 7 elements (2 marks)
(ii) Write a PASCAL program to output the square of even integers in the range 2 to 40 (6 marks)
c) Write a subroutine that swaps the values of two REAL numbers X and Y (5 marks)
[15 marks]