Question

Design and write a program which covers a minimum of ANY SIX (6) of

the following items. (( C++ ))

1) Variable(s)

2) Escape sequence(s)

3) Assignment statement(s)

4) Initialization statement(s)

5) Comment statement(s)

6) cin function(s) to read user input

7) Expression(s)

8) Any function(s) from the iomanip library.

9) Any function(s) from the cmath library.

10) Constant variable(s)

Answer 1

What does my program does is ... it read the radius which is given by user and return Area and Circumference of Circle

I have used

1) Variable(s) // r, area, circum,pi

2) Escape sequence(s) // \n

3) Assignment statement(s) //  area = pi * pow(r,2); circum = 2 * pi * r;

5) Comment statement(s) // comment

6) cin function(s) to read user input // read radius r

7) Expression(s) //  area = pi * pow(r,2); circum = 2 * pi * r;

9) Any function(s) from the cmath library. //pow

10) Constant variable(s) // pi

Here is code:

#include<iostream>
#include<cmath> // pow()
using namespace std;
int main()
{
// declaring 3 variable of float r, area, circum
   float r, area, circum;
   //contant variable pi
   const float pi = 3.14;
   cout<<"Enter the radius of the circle :";
   //read radius of circle using cin
   cin>>r;
   //using cmath(pow), calculation the power r square 2 and assigning to area variable
   area = pi * pow(r,2);
   circum = 2 * pi * r;
   //printing the area variable area and circum and for print new line \n escape sequence is used
   cout<<"Area of the circle = "<<area<<"\nCircumference of the circle = "<<circum<<"\n";
   return 0; // return 0 to main end exit
}

Output:

Enter the radius of the circle :2 Area of the circle 12.56 Circumference of the circle 12.56