Question

Submit a c++ file:

2. Write a program that defines the named constant PI, const double
PI = 3.14159;, which stores the value of p. The program should use PI
and the functions listed in Table 6-1 to accomplish the following:

a. Output the value of Pi Output the value of Pi.
b. Prompt the user to input the value of a double variable r, which stores the radius of a sphere. The program then outputs the following:
i.   The value of 4Pir2, which is the surface area of the sphere.

ii.   The value of (4/3)Pir3, which is the volume of the sphere

• 
  

Answer 1

• The program prints the value of PI
• Reads the value of radius to the variable r from console.
• Calculate the surface area of the sphere using the formula and volume of the sphere using the formula
• Print the values of surface area and volume

Following is the C++ code for calculating the surface area and volume of a sphere using the radius. Here we are defining a constant double variable PI with value 3.14159 ( A constant variable means which cannot be modified once they are defined).

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#include <iostream>
using namespace std;
int main() {
const double PI=3.14159; // Declare a constant double variable PI
//Following 3 lines declare 3 variables as double type
double r;
double surf_area;
double vol;
cout<<"----------------------------------------"<<endl;
// Following line prints the value of PI
cout<<"PI=" << PI << endl;
cout<<"----------------------------------------"<<endl;
cout<<"Please enter the radius of the sphere:";
//Following line reads the entered radius and assigns to the variable r
cin>>r;
surf_area=4*PI*r*r; //Calculating surface area of the sphere=4PIr^2;
vol=(4*PI*r*r*r)/3;//Calculate volume of the sphere=4/3PIr^3;
//Following two lines prints the surface area and volume of the sphere
cout<<"----------------------------------------"<<endl;
cout<<"Surface area of the sphere=" << surf_area << endl;
cout<<"Volume of the sphere=" << vol << endl;
return 0;
}
The screenshot of the result is given below