java program

[wagpofafi]

does anyone here know how tom make a computing program like this
>user will be asked to input a math problem like 5+5
>and when user press enter it will show output
>the answer is = 10

the problem is i dont know how to make it comput the math problem with just a 1 input,
i can program it asking the user with 2 input.

i hope someone knows it how to do it in java thanks in advance

[umbra]

You can use only one input and have the other operand as a constant.
So let's say you input 8 and always do the calculations with a constant like 5.
And you will have for example:
8+5

input 4

4+5

and so on.

[Geek-9pm]

Java tutorial was recently updated.
http://download.oracle.com/javase/tutorial/
The file API is new
http://download.oracle.com/javase/tutorial/essential/io/fileio.html
Passing stuff from the command line:
http://download.oracle.com/javase/tutorial/essential/io/cl.html
Hope this is of some help.

The conventional way to pass two numbers from console input is to separate them with a comma.

[Sidewinder]

I may have misinterpreted, but I suspect the OP wants to enter a math expression and have the Java do the computes.

My Java skills are a bit lower than zero, but with a little help from Google, NetBeans, and a little luck, I came up with this:

Code: [Select]

import java.io.*;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;

public class JavaApplication66 {

  public static void main (String[] args) throws Exception {
    String strExp = null;
    String strQuit = "quit";
    while (true) {
      System.out.print("Enter expression: ");
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      try {
        strExp = br.readLine();
        if (strExp.equals(strQuit)) {
          System.exit(0);
        }
        ScriptEngineManager mgr = new ScriptEngineManager();
        ScriptEngine engine = mgr.getEngineByName("JavaScript");
        System.out.println(engine.eval(strExp));     
      }
      catch (IOException e) {
        System.out.println("Error!");
        System.exit(1);
      }
    }
  }
}

This will handle the arithmetic stuff, but other things like exponents and such probably require something more sophisticated. Program runs in an infinite loop...Enter quit to exit program.

Good luck. 

[reddevilggg]

I also may have misinterpreted, but i think you've just this guys homework for him. 

[wagpofafi]

I also may have misinterpreted, but i think you've just this guys homework for him. 

yeah,it's a home work,but before posting here i already pass my homework,the question that i post here was a plus points if done,and after passing it still can't do it so i decided to ask here,

I may have misinterpreted, but I suspect the OP wants to enter a math expression and have the Java do the computes.

My Java skills are a bit lower than zero, but with a little help from Google, NetBeans, and a little luck, I came up with this:

Code: [Select]

import java.io.*;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;

public class JavaApplication66 {

  public static void main (String[] args) throws Exception {
    String strExp = null;
    String strQuit = "quit";
    while (true) {
      System.out.print("Enter expression: ");
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      try {
        strExp = br.readLine();
        if (strExp.equals(strQuit)) {
          System.exit(0);
        }
        ScriptEngineManager mgr = new ScriptEngineManager();
        ScriptEngine engine = mgr.getEngineByName("JavaScript");
        System.out.println(engine.eval(strExp));     
      }
      catch (IOException e) {
        System.out.println("Error!");
        System.exit(1);
      }
    }
  }
}

This will handle the arithmetic stuff, but other things like exponents and such probably require something more sophisticated. Program runs in an infinite loop...Enter quit to exit program.

Good luck. 

thanks your code worked!!

Java tutorial was recently updated.
http://download.oracle.com/javase/tutorial/
The file API is new
http://download.oracle.com/javase/tutorial/essential/io/fileio.html
Passing stuff from the command line:
http://download.oracle.com/javase/tutorial/essential/io/cl.html
Hope this is of some help.

The conventional way to pass two numbers from console input is to separate them with a comma.


thanks you for the links!

[reddevilggg]

yeah,it's a home work,but before posting here i already pass my homework,the question that i post here was a plus points if done,and after passing it still can't do it so i decided to ask here,

So, what have you learned from this

[wagpofafi]

study more 

and this
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;