Area of circle and circumference

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Hii from Team(S.A.O.P)

Today's topic is C++ program for finding area of circle and circumference of circle. we gonna make a program called "Circle.cpp"(C++ Program)....although we need little bite knowledge of Maths(formulas of finding area of circle and circumference).

Lets begin with basic knowledge of maths(circle).

June117.blogspot.com

The distance around a circle is called its circumference.

 The distance across a circle through its center is called

 its diameter. We use the Greek letter  (pronounced Pi)

 to represent the ratio of the circumference of a circle to the

 diameter.

 = 3.14

i have just wrote Important points here..

Formula of Area of circle:

Area = *Radius²

how we gonna write this in our program

for  here i have created one variable called PI and assign a value 3.14(The value of ) 

PI = 3.14

Area = PI*r*r;

 Formula of circumference:

there is two way to find circumference

i)Ci = 2**r

ii)Ci=*d

note: "d" is our diameter

now lets implement this in our program.

Program

#include"iostream"
#include<conio.h>
using namespace std;//If your using turbo c then remove this statement
class Circle {
public:
int rad;
    float PI = 3.14, area, ci;
void area_of_circle()
{
cout<<"Enter radius of circle: "<<endl;
    cin>>rad;
   area = PI * rad * rad;
  cout<<"Area of circle : "<< area<<endl;
}
void circumference()
{
ci = 2 * PI * rad;
  cout<<"Circumference : "<< ci<<endl;
}
};
int main(int argc, char**argv)
{
cout<<"June117.blogspot.com"<<endl;
Circle c1;
c1.area_of_circle();
c1.circumference();
getch();
return 0;
} 

Summery: 

In above program i have created a class called Circle.in class i have developed two function one for finding area of circle and second for circumference.

 I define radius as integer and PI( = 3.14),area and ci(circumference) as Float.

If your Using Turbo C/C++  for coding this program then don't forget to put "getch()" and you don't need to write "Using namespace std;"

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