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Example of constant declaration:
const int averageMarks = 50;

const double bankRate = 0.15;

The following Program Example 4.11 demonstrates an example of a C++ program Chapter Four: Object oriented programming with C++
FOR ONLINE READING ONLY
that uses constant. The program computes the area of the circle, and it displays the
output on the screen. The output is shown in Figure 4.25.

Program Example 4.11:

A C++ program that uses constant

#include<iostream>

using namespace std;

int main()
{

const double PI = 3.142; //declare PI as a constant

double radius, area;
cout<<”Enter a radius: “;

cin>>radius;

area = PI*radius*radius; //compute the area

cout<<”The area of the circle is “<<area<<endl; //display the output
return 0;

}

Output:

Figure 4.25: Output of the program

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