how to solve a String like (3+2*6) to get the result 15?

Question

I want to make a calculator in java.

I need to know that is there any way to solve a String Mathematically?

for example:

String str = "3+2*6";

and somehow I'll get:

int result = 15;

`3+2*5*` never equals to `15`, its like `3+(2*5)` in real, even more it's like `3+(10)`. — Azad, Jul 25 '13 at 08:08
`3+2*6 == 15` and `3+2*5 == 13` It's confusing the way it is written, but it is correct. — Peter Lawrey, Jul 25 '13 at 08:08
@Azad `3+2*6` (as in the title) is `15`, `3+2*5` (as in the question) is `13`... both are correct. — Vincent van der Weele, Jul 25 '13 at 08:09

score 1 · Accepted Answer · edited Jul 25 '13 at 08:34

1

Try this:

ScriptEngineManager mg = new ScriptEngineManager();
ScriptEngine engine = mg.getEngineByName("JavaScript");
String val = "3+2*5";
System.out.println(engine.eval(val));

edited Jul 25 '13 at 08:34

Maroun

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answered Jul 25 '13 at 08:13

Ruchira Gayan Ranaweera

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how to solve a String like (3+2*6) to get the result 15?

1 Answers1