Write a program to calculate area and perimeter of a circle

calculate area and perimeter of a circle
it is easy to understand & write .

plz. help i am new to java
can u tell what is use of writig String[] args in main method

Thank-you

How to teach mathematics?
I enjoy your work very much. I will be happy if you send to me some material of mathematics so that i can add my knowledge.

find arror in belows program.
public class ComputeArea { public static void main(String[] args) { double radius; double area; } //Assign a radius radius= 20; //Compute area area= radius * radius * 3.14159; }

ieee projects titles and source code
dear sir, this site help me for learn java programming .

Programming in Fortran
Please I want you to help me write a programe in Fortran 77 to calculate the area and circumference of a circle respectively. And also draw a flowchart to represent it. Tnank you so much!

JAVA NOTES
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programs

wrte a java program to print all even no.
explain this program

fact of a given number
#include<iostream.h> int main(void) { int number; cin>>number; for(int i=1,long int fact=1;i<=number;i++,fact*=i); cout<<fact; return(0); }

java lang
i looking for a java programme to calculate an area and perimeter of a square please send me the details

java lang
SHOW ALL THE CODE FOR MAKKING A MATH TOTUR PROGRAMME

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