Page 255 - Computer_Science_F5

Computer Science Exercise 4.9 18 2 . % 

1. Write a C++ program that will enable customers to know the Value-Added Tax
to be paid for any purchase price of the commodity. The VAT rate of 18.2%
should be declared as a constant, and the formula should be (VAT
FOR ONLINE READING ONLY
Purchase prices).
2. Differentiate the terms variable and constant as applied in C++ programming
3. Create a C++ program that prompts a user to enter a radius of the sphere. The
program should calculate and display the volume of the sphere as output. (Hint:

The formula for calculating the volume of the sphere is 4 r  3 , r represents the
radius of the sphere). Use Table 4.6 in your declaration. 3

Table 4.6: Declaration

Data name Data type Declaration type
Pie ( ) =3.1415926 Double Constant
Radius Float Variable
Volume Double Variable

4. (a) What are the benefits of using 5. Consider the following program:
constants in a C++ program? #include <iostream.h>
using namespace std;
(b) What is wrong with the
following C++ program? int main()
{
Explain.
int a;
int b;

#include<iostream> a=2;
b=5;
#define PI = 3.142; a=b;
using namespace std; b=4;
int main() cout << “a= “ << a << endl;
{ cout << “b= “ << b<< endl;
double temp = PI*5; return 0;
cout<<temp<<endl; }
return 0; (a) What is the output of this
} program?
(b) Using a diagram, illustrate
how memory changes during
variable assignment.

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for Advanced Secondary Schools

Computer Science Form 5.indd 246 23/07/2024 12:33