converting jdouble to double of type c

Question

How can i convert `jdouble` of java type variable to `double` variable of type c ?

Accepted Answer

You don't have to, it's just a typedef like so:

```
typedef double jdouble;
```

So no conversion is needed, once you have a `jdouble` you can treat it just as a `double`.

See for instance this code example from Standford:

```
JNIEXPORT jdouble JNICALL Java_Summer_sum__DD
(JNIEnv *env, jobject jobj, jdouble j1, jdouble j2) {
    return j1 + j2;
}
```

The addition is done directly with the `jdouble` values, trusting the compiler to figure out how to generate the required code.

Solution