Question

Write a program that prints the sum of its command-line arguments (assuming they are numbers).

For example,

java Adder 3 2.5 -4.1

should print The sum is 1.4

Answer 1

import java.text.DecimalFormat;

//class definition
public class Adder {

   //main class definition
   public static void main(String[] args) {
      
       //eclare and initialise variable to store sum and number converted from string
       double sum = 0, num=0;
      
       //for loop to read command line arguments
       for(int i=0;i<args.length;i++) {
           //Convert argument from string to double
           num = Double.parseDouble(args[i]);
          
           //calculate the sum
           sum = sum + num;
           }
      
       //create a decimal formal object to help round result to 2 decimal places
       DecimalFormat format = new DecimalFormat("0.0");
       //Print the result with the help of format object
       System.out.println("The sum is " + format.format(sum));
   }

}

OUTPUT