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Program 3 Write a Java program to print the cost of 25 pens if the cost of 40 pens is Rs. 2000.
1 class initialization
2 {
3 public static void main()
4 {
5 double a,b,c,d;
6 a=25;
7 b=40;
8 c=2000;
9 d=c/b*a;
10 System.out.println("Cost of 25 pens "+d);
11 }
12 }
You will get the following output:
6.4 INPUT USING PARAMETERS
We can take values using parameters. There are two ways to take input: using command-line arguments or by
passing arguments during a method call when the program is executed.
6.4.1 Using Command Line Arguments
We use command-line arguments to input values as strings in the main() method, as it is the first method invoked
when the program starts. These values are passed as a String array and can be used in the program. If a value
needs to be used as an integer or a real number, it must be converted using the appropriate methods, such as
Integer.parseInt() for integers or Double.parseDouble() for real numbers.
Write a Java program to take the radius of a circle using Command Line Arguments and print
Program 4
the area and circumference.
1 class input_using_cla
2 {
3 public static void main(String args[])
4 {
5 double r,a,c;
6 r=Double.valueOf(args[0]);
7 a=3.142*r*r;
Input in Java 123

