Java HotSpot Virtual Machine

Hi,

I'm trying to get a float value from my C++ program to Java. I'm creating the float variable in eVC++ and doing some calculation with that and then want to return the float in java. But I always get the value of float variable in Java is 0.0. And I also can't check the value of 'width' in eVC++. How can I print the value of float in a messagebox in eVC++ or in Java console from C++ program? How can I get the C++ float value to Java? The C++ code -

JNIEXPORT jfloat JNICALL Java_packageName_ClassName_methodName(JNIEnv *env, jobject, jstring jStr) {

float width;
....
doing something with width
....
return width;
}

Any idea???

thanx