|
| |
| 6. 48. 3. 功能评估 |
|
|
|
import java.io.FileReader;
import java.io.IOException;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class FuncEvaluator {
public static void main(String[] args) {
if (args.length != 2) {
System.err
.println("usage: java FuncEvaluator scriptfile " + "script-exp");
return;
}
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("rhino");
try {
System.out.println(engine.eval(new FileReader(args[0])));
System.out.println(engine.eval(args[1]));
} catch (ScriptException se) {
System.err.println(se.getMessage());
} catch (IOException ioe) {
System.err.println(ioe.getMessage());
}
}
}
//////////////
function combinations (n, r)
{
return fact (n)/(fact (r)*fact (n-r))
}
function fact (n)
{
if (n == 0)
return 1;
else
return n*fact (n-1);
}
|
|
|