StringTokenizer to read in 4 variables from the command point

Question

Hi,
I need to set up the Java StringTokenizer to read in 4 variables
from a command prompt. It should be in the following format:
X variable1 variable2 variable3where
(is the command prompt)X (is either +, -, *, /, c, or e)
variable1 variable2 and variable3 are integers.
I would appreciate any answers that would help me find the way!
Thanks in advance.

Answer 1

Thank you for the code snippet, but the program does not function that way. Ie, it does not accept
arguments when the program is first run, only after the program has excecuted.
The program is to enter a simple command prompt, and await instructions in the form X int1 int2 int3
where X can be c (convert the number int3 from number base int1 to number base int2), e (exit the
program), +,-,/,* (add, subtract, divide or mutilply int2 to/by int3 in number base int1). Here is an example
of the what the program execution should look like:
c:\programming\java nbc
> + 10 23 45 // Add 23+45 in base10
68 // Write the answer on a new line and prompt
- 16 5A 2C // Subtract 5A-2C in base 162E // Write the answer on a new line and prompt
c 15 7 2E // Convert 2E in base 15 to base 762
e // End of programc:\programming\
My problem is, I do not know how to convert the first token to a variable that can be used to carry out one of
the above mentioned procedures. For example, the first token taken from the command c 15 7 2E is "c".
As I understand it, "c" is simply a string, and this cannot be used in logical procedures such as:
int procedure = 0;
if(operator == "c")
     procedure = 0;  //then use this variable
}else
if(operator == "e")
    System.exit(0): //quit the program
Also, how can I set up a while loop to continuesly
prompt the user for an instruction until "e" is entered?import java.io.*;
import java.util.*;
import java.util.StringTokenizer;
public class blerk
     public static void main(String[] args) throws IOException
          InputStreamReader stdin = new InputStreamReader(System.in);
          BufferedReader br = new BufferedReader(stdin);
          boolean e = true;
          String str = "";
          String symbol = "";
          int value0 = 0;
          int value1 = 0;
          int value2 = 0;
          System.out.print(">");
          str = br.readLine();
          StringTokenizer st = new StringTokenizer(str, " ");
          int i = 0;
          int option = 0;
          while (st.hasMoreTokens())
               switch(i)
                    case 0:
                         symbol = st.nextToken();
                         // This part is obviously not correct. How can this be implemented to select and store the operating procedure the user enters?
                         if(symbol = "e")
                              System.exit(0);
                         }else
                         if(symbol = "c")
                         }else
                         if(symbol = "+")
                              option =
                    break;
                    case 1:
                         value0 = Integer.parseInt(st.nextToken());
                    break;
                    case 2:
                         value1 = Integer.parseInt(st.nextToken());
                    break;
                    case 3:
                         value2 = Integer.parseInt(st.nextToken());
                    break;
                    default:
                         System.out.println("format: >operator x y z");
                    break;
               i++;
          System.out.println(symbol + value0 + value1 + value2); //test
Any advice would be most appreciated.
Benjamin.