NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
JANUARY 2021 EXAMINATION

COURSE: CIT 392 - Computer Laboratory II

Credit: 2 units

TIME ALLOWED: 2 Hours

INSTRUCTION: Answer Question 1 and any other THREE (3)

Questions 1a)

Discuss the procedural, structural and object-oriented programming paradigms.(3marks)

b) Describe the features of C++ programming language.(2 marks)

c) Construct the syntax for user-defined packages in Java(3 marks)

d) Briefly give 5 examples of Maths methods in Java and state the function of each method.(2 marks)

e)i.) Give the general form of a one-dimensional array with an example.(1 mark)

ii) Write a Java program to find the mean of an array of 10 arbitrary values.(4 marks)

f) i.)Explain the projection, selection and joining capabilities of SELECT statement in SQL .(1 marks)

ii. Use the EMPLOYEES table aboveand listing the output:

I. Write a query to retrieve the last name and salary from the EMPLOYEES table for any employee whose salary is between 2500 and 2600.(2.5 marks)

II. Write a query that retrieves the employee ID, first name, last name and the department ID of employees in department 30.(2.5 marks)

III. Write a query to retrieve the last name and salary from EMPLOYEES table for any employee whose salary is less than or equal to 2900.(2.5 marks)

2.a. State the features of ADA programming language.(5marks)

b. Write a ADA programming language that will find the roots of a quadratic equation ax2 + bx + c = 0 using the quadratic formula.(10 marks)

3. a . Differentiate between structural and object-oriented programming paradigm for COBOL.(3 marks)

b. Given a rate of exchange of the naira (Rate) to the US$ design a COBOL program to convert a certain amount of US$ to the naira (Dollar).Your result is Exchange(12 marks)

4.a) Describe an array.(1 mark)

b) Write a Java program to calculate the sum of integers from 1 to 100.( 8 marks)

c.) Multidimensional arrays are actually arrays of arrays in Java, write a Java program that allocatesa 2 by 3 array and assigns it to names. The array is {{"Mr. ", "Mrs. ", "Ms. "}, {"Alan", "Charles" }}. Show the output.(6 marks) 5a. Explain the connection between SQL and relational database.(1 mark) b. Using the EMPLOYEREES table above:

i. Write a query to retrieve the employee numbers, last name and salary from the EMPLOYEES table for any employee whose employee number is 101,103,105,106 or 110 (6 marks) Ii Write a query to display the employee number, first_name and hire_date of employees. The result should be displayed in such a way that the first names will be arranged alphabetically.(8 marks)

ii. Use the EMPLOYEES table aboveand listing the output:

I. Write a query to retrieve the last name and salary from the EMPLOYEES table for any employee whose salary is between 2500 and 2600.(2.5 marks)

II. Write a query that retrieves the employee ID, first name, last name and the department ID of employees in department 30.(2.5 marks)

III. Write a query to retrieve the last name and salary from EMPLOYEES table for any employee whose salary is less than or equal to 2900.(2.5 marks)

2.a. State the features of ADA programming language.(5marks)

b. Write a ADA programming language that will find the roots of a quadratic equation ax2 + bx + c = 0 using the quadratic formula.(10 marks)

3. a . Differentiate between structural and object-oriented programming paradigm for COBOL.(3 marks)

b. Given a rate of exchange of the naira (Rate) to the US$ design a COBOL program to convert a certain amount of US$ to the naira (Dollar).Your result is Exchange(12 marks)

4.a) Describe an array.(1 mark)

b) Write a Java program to calculate the sum of integers from 1 to 100.( 8 marks)

c.) Multidimensional arrays are actually arrays of arrays in Java, write a Java program that allocatesa 2 by 3 array and assigns it to names. The array is {{"Mr. ", "Mrs. ", "Ms. "}, {"Alan", "Charles" }}. Show the output.(6 marks)

5a. Explain the connection between SQL and relational database.(1 mark)

b. Using the EMPLOYEREES table above:

i. Write a query to retrieve the employee numbers, last name and salary from the EMPLOYEES table for any employee whose employee number is 101,103,105,106 or 110 (6 marks)

Ii Write a query to display the employee number, first_name and hire_date of employees. The result should be displayed in such a way that the first names will be arranged alphabetically.(8 marks)