ICS 101 - Computer programming

Lab # 7

(Subroutines)

Objectives

•     SUBROUTINES

A subroutine may return zero, one or many results. (Remember that a function can return only one result). Unlike function, a subroutine name can not be used as a variable to hold results.

Syntax

Example

Following is the output of the program.

Exercise 1

Write a program which reads the length and width of a rectangle and prints the area and perimeter of that rectangle. The area and perimeter must be computed by a subroutine  AREAPR called by the program. Use any positive numbers as data.

Exercise 2

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Write a program which reads the surface area s of  a  right  circular cylinder of height r /Ö 3.0 where r is the radius. The program then calls a subroutine that computes the radius r and the volume v of that cylinder. And pass them back to the main program. The main program then prints these two values.

Use the data: 155.0

Your output should be in the form:

RADIUS  =  6.536668  CM

SURFACE AREA  =  155.000000  CM SQUARED

VOLUME  =  506.591800  CM CUBED

NOTE:

___                       ___

v = pr3 Ö 3.0,           s = 2pr2 Ö 3.0,         p  = 3.14159

Exercise 3

Write a subroutine that converts a number of seconds into hours, minutes, and seconds. For example, 3724 seconds is 1 hour, 2 minutes, and 4 seconds. Write a main program to test the subroutine.

Exercise 4

Given the number of hours worked by an employee in a week and the payment per hour, write a subroutine that returns the regular payment, over-time payment, and the total payment. The over-time payment is calculated as follows: every hour after 40  is considered as 1.6 hours. Write a main program to test the subroutine.