Hi guys. Need help... I tried running the code for trapezoidal rule. It's my project in Numerical Methods, here's the code: Code: static double trapezoidRule (int size, double[] x, double[] y) { double sum = 0.0, increment; for ( int k = 1; k < size; k++ ) {//Trapezoid rule: 1/2 h * (f0 + f1) increment = 0.5 * (x[k]-x[k-1]) * (y[k]+y[k-1]); sum += increment; } return sum; } public static void main ( String[] args ) throws Exception { String fileName = args.length > 0 ? args[0] : "InpData.txt"; Scanner inp = new Scanner(new File(fileName)); int k, size; double[] x, y; double integral; size = inp.nextInt(); System.out.println ("Number of points: " + size); x = new double[size]; y = new double[size]; for ( k = 0; k < size; k++ ) { x[k] = inp.nextDouble(); y[k] = inp.nextDouble(); } integral = trapezoidRule (size, x, y); System.out.printf ("Integral: %4.4f\n", integral); System.out.printf ("Check: log(%2.2f) = %8.8f\n", x[size-1], Math.log(x[size-1]) ); } } It cannot be compiled and I always get FileNotFoundException. I found on Javadocs that this will be thrown when a file with the path name does not exist. Please help. Thanks!