Convert Rupees to Paises

Hooray!!! Here is the first post of this blog. I'm a newbie java programmer and hence will start with a basic program.

Problem statement

Write a program to convert a given Rupees ( it may include paises also) into paises. Rupee and Paise are Indian currency denominations ( 1 Rupee = 100 paises).

Sample invocation 

             paiseConverter 34.565

Output

                Amount entered = 34.565 Rupees
                Total paises = 3965.0 Paises

Learning

• How to split string?
• Converting String to Double
• Reading command line arguments
• How to check a string is numeric type ? 

Know-how: Reading command line arguments - How it works?

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

amount = br.readLine();

• System.in : It allows you to read from the standard input (mainly, the console)
• InputStreamReader : It is a bridge from byte streams to character streams.It reads bytes and decodes them into characters using a specified charset. 

         It reads single character each time from console and groups characters.

• BufferedReaders: It read large chunks of data from a file at once, and keep this data in a buffer. When you ask for the next character or line of data, it is retrieved from the buffer. In addition BufferedReader provides more convenient methods such as readLine(), that allow you to get the next line of characters from a file.

        It reads a line of data from InputStreamReader.

Tips

• To display line numbers in eclipse : Window -> preferences -> General -> Text Editors -> Show Line numbers
• Debugging in eclipse:  Place break points by double clicking on left most end on editor, select Debug perspective, run in debug mode (select cockroach symbol), once it reaches break point  select Step over (F6) or Step Into (F5) and keep watching the variable values.
• Providing command line arguments through eclispe Run Configurations : Run -> Run Configurations -> Arguments -> Program arguments. To make eclipse to prompt for arguments every time we run, add ${string_prompt} in Program arguments. 
• This program accepts input from eclipse console.

Source code