public/subjects/java-piscine/DoOp/README.md

## DoOp

### Instructions

Create a file named `DoOp.java`.

Write a function `operate` that returns the result of the given arithmetic operation specified in the parameters. The arguments should be passed in the following order:
- The first argument is the right operand
- The second argument is the operation sign
- The third argument is the left operand


### Expected Functions

```java
public class doOp {
    public static int operate(String[] args) {
        // your code here
    }
}
```

### Usage

Here is a possible ExerciseRunner.java to test your function :

```java
public class ExerciseRunner {
    public static void main(String[] args) {
        System.out.println(doOp.operate(new String[]{"1","+","2"}));
        System.out.println(doOp.operate(new String[]{"1","-","1"}));
        System.out.println(doOp.operate(new String[]{"1","%","0"}));
        System.out.println(doOp.operate(args));
    }
}
```

and its output :

```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner
3
0
Error
it depend on the input.
$
```

### Notions

[Command-Line Arguments](https://docs.oracle.com/javase/tutorial/essential/environment/cmdLineArgs.html)
[Operators](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html)
[Conditional statement](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/if.html)
[String](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html)
[Array](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html)