First of all, you should know what is area of circle and also, find the area of circle formula. The area of a circle is the number of square units inside that circle. If each square in the circle to the left has an area of 1 cm 2 , you could count the total number of squares to get the area of this circle. If a circle has a radius of 5, its area is 3. My name is Devendra Dode.
C program to find diameter, circumference and area of circle using function
C program to find diameter, circumference and area of circle using function - Codeforwin
Area and Circumference of a Circle. Some things to notice:. Note that the type for each is given in these lines: final double for PI, since it is a floating point constant; int for radius, since it is an integer variable, and double for area, since it will hold the product of the radius and PI, resulting in a floating point value. These could have been done separately, but it is often convenient to assign an initial value when a variable is declared. Note that this is not a declaration, so the int that was in the previous radius line does not appear here. The same memory location that used to hold the value 10 now holds the value 20—we are not setting up a new memory location. Save this program, which is in file Circle.
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This appendix contains the answers to the excerses that appear throughout the book. As you see, we started this program with a typical! We also turned on warnings. There are several reasons a good programmer will prefer to use a constant  value like this: it takes time to type 3. It may be a mathematical bug if you accidentally used 3.
A circle is a simple geometrical shape. A circle is a set of all points in a 2D plane that are at a given distance from a given point called centre. A circle can be uniquely identified by it's center co-ordinates and radius.