Program Development 3

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` Jamwa has just inherited Ushs.1000,000. he

decides to place the money in a two year

certificate of deposit paying 9.6% interest,

compounded quarterly. What will be the value of Jamwa¶s investment after two years have passed?



1. What results are we trying to obtain: what is the

required output ?

2. What data are given: What is the input supplied?

3. Do we have enough information to obtain therequired output from the given input ?



Choose variables to represent the given input and

required output

Think of formulas or logical processes that will be

required to carry out in order to get the desiredresults



` Input variables: P: Initial Amount

R: Interest Rate

N: Number of times per year that compounding

takes place T: Number of years the money is invested

Output Variables:

A: Value of the investment after two years

We should use the compound interest formula, A = P(1 + R/N)NT

Note: interest R must be expressed as a decimalnot as a percentage



` In designing the program, give a step-by-stepprocedure for solving the problem. Such a processis called an algorithm.

` Two of the most popular standard formats for presenting the design of the program are f lowcharts and pseudo code

` A f low chart gives a pictorial representation of the design through processing symbols. They are

excellent tools for showing the structure of someprogramming statements and blocks of code



` For our given problem, these tasks are;

1. Assign the given data to the variables (P, R, N

and T)

2. Compute the final Amount ( A) by using thecompound interest formula

3. Print the value A



` Now sit down and, using the design as an outline,

write the statements or code for the program in

any programming language of your choice such as

BASIC, Visual-Basic, C, C++ or Java



//******** This program calculates Jamwa¶s investment **********//import java.io.*;Public Class Jamwa {

Double P = 1000000; final float R=0.096; int N = 4; int T = 2;public static void main(String args[]){

Float A; A = P*(1+R/N)^N*TSystem.out.println(³The value of an Investment of´; P; ³Shillings´);System.out.println(³Invested at a rate of´; R*100; ³Percent´);

System.out.println(³Compounded´; N; ³Times per Year´);System.out.println(³For´; T; ³Years is´);

System.out.println ( A; ³Dollars´);}

}



` Testing the program ensures that it is free of errorsand that it in fact does solve the given problem

` The process of finding and correcting program errors(getting the bugs out) is called debugging.

` Two types of errors that may arise are known assyntax errors and logic errors.

` A syntax error arises as a result of violation of thelanguages¶ rules of statement structure. They can becaused by misspelling or omitting a key word or byfailing to put the statement in the proper format.



` A logic error is one that leads to incorrect results whenthe program is executed, or it may lead to no results atall.

` It can occur due to faulty analysis, faulty design or a

failure to code the program correctly.` Editing a program: Any syntax or logic errors in your

program must be corrected.

` If the program has already been entered, then it has tobe edited to make the change.

` Editing a program is the process of makingmodifications in it for any reason (error related or not)



` Find the volume (v) of a pyramid with square base

45cm on each side (s) and 75cm in height (h).

Use the formula V=s2h/3

` Note:i. Analyze the problem; list all necessary variable.

ii. Design a program using pseudo code or

flowcharts to solve it

iii. Code your program

Program Development 3

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