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Thread: Please help me with this Java programming

  1. #1
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    Default Please help me with this Java programming

    Hello everyone I am a BSC Mathematics student and very beginner in Java Programming and as part of my Mathematics degree I am also learning Algorithm with Java programming. I am in very early stages of Java so I could be making very silly mistake but believe it or not but I am stuck with this error for last 2 days but still cannot figure out where is the problem. Anyone please help me I will really appreciate that.

    Following is the programme code I am using:
    import java.io.*;
    import javagently.*;
     
    class CW2Q1
    {
    	//Main program to run the Gaussian Quadrature.
     
    		   public static void main(String[] args) throws IOException
    			{
     
    					Gauss_Quadrature_Data = new Gauss_Quadrature_Data();
    					Gauss.input_data();
    					Gauss.cal_x();
    					Gauss.cal_fx();
    					Gauss.cal_sum();
    					Gauss.store_x_output();
    					Gauss.store_f_output();
     
    					BufferedReader user_keyin= Text.open(system.in);
     
    					System.out.print("What is your a");
    						int input_a = Text.readint(user_keyin);
    					System.out.print("What is your b");
    						int input_b = Text.readint(user_keyin);
    					System.out.print("What is your n");
    						int input_n = Text.readint(user_keyin);
    			}
     
     
    		static class Gauss_Quadrature_Data
    		{         
    			        double sum, x, fx;
    					int n=0; n<=3; n++;
     
    									 if (n==0); {
    										double [] []  t; c = new double[0.5773502692, -0.5773502692; 1.0000000000, 1.0000000000];
    									} else
    									if n==1); {
    									double [] [] t; c = new double[0.7745966692,	 0.0000000000, -0.7745966692; 0.5555555556, 0.8888888889, 0.5555555556];
    									}else
    									if (n==2); {
    										double [] [] t; c = new double[0.8611363116, 0.3399810436, -0.3399810436, -0.8611363116; 0.3478548451, 0.6521451549, - 0.6521451549, - 0.3478548451];
    									} else
    									if (n==3); {
    										double [] [] t; c =new double[0.9061798459, 0.5384693101, 0.0000000000, -0.5384693101, -0.9061798459;  0.2369268850, 0.4786286705, 0.5688888889, 0.4786286705, 0.2369268850];
    									 }
    		}
     
    		void input_data() throws IOException
    		{
    			//BufferedReader user_keyin = Text.open(System.in);
    			//System.out.print("User please key in the arraysize:");
    			BufferedReader user_file = Text.open("CW2Q1_data.txt");
    		}
     
    		void cal_x()
    		{
    				cal_x = ((b-a)*(double)(t)+b+a)/2;
    				return cal_x;
    		 }
     
    		void cal_fx()
    		{
    				cal_fx = Math.pow(x[t],2)*math.sin (x[t])*(b-a)/2;
    				return cal_fx;
    		}
     
    		void cal_sum()
    		{ // this section calculates the sum of a product c*fx
    			double cal_sum(double fx, double c)
    			 sum = 0.0;
    			double cal_sum = sum + (double)(c)*(double)(fx);
    			return cal_sum;
    		}
    }


    PLEASE HELP AS I NEED TO HAND THIS IN ON FRIDAY AND IT'S 50% OF MY ASSIGNMENT PLEASE HELP
    Last edited by helloworld922; March 10th, 2010 at 01:23 PM.


  2. #2
    Junior Member tina G's Avatar
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    Default Re: Please help me with this Java programming

    what's your problem here?

  3. #3
    Junior Member tina G's Avatar
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    Default Re: Please help me with this Java programming

    import java.io.*; 
     
    public class CW2Q1 {
     
        public static void main(String[] args)throws IOException {
        	Gauss_Quadrature_Data = new Gauss_Quadrature_Data();
    					Gauss.input_data();
    					Gauss.cal_x();
    					Gauss.cal_fx();
    					Gauss.cal_sum();
    					Gauss.store_x_output();
    					Gauss.store_f_output();
     
    					BufferedReader user_keyin= Text.open(system.in);
     
    					System.out.print("What is your a");
    						int input_a = Text.readint(user_keyin);
    					System.out.print("What is your b");
    						int input_b = Text.readint(user_keyin);
    					System.out.print("What is your n");
    						int input_n = Text.readint(user_keyin);
    			}
     
     
    		static class Gauss_Quadrature_Data
    		{         
    			        double sum, x, fx;
    				for (int n=0; n<=3; n++;){
    				}
     
    									 if (n==0) {
    										double [] []  t; c = new double[0.5773502692, -0.5773502692; 1.0000000000, 1.0000000000];
    									} else
    									if n==1) {
    									double [] [] t; c = new double[0.7745966692,	 0.0000000000, -0.7745966692; 0.5555555556, 0.8888888889, 0.5555555556];
    									}else
    									if (n==2) {
    										double [] [] t; c = new double[0.8611363116, 0.3399810436, -0.3399810436, -0.8611363116; 0.3478548451, 0.6521451549, - 0.6521451549, - 0.3478548451];
    									} else
    									if (n==3) {
    										double [] [] t; c =new double[0.9061798459, 0.5384693101, 0.0000000000, -0.5384693101, -0.9061798459;  0.2369268850, 0.4786286705, 0.5688888889, 0.4786286705, 0.2369268850];
    									 }
    		}
     
    		void input_data() throws IOException
    		{
    			//BufferedReader user_keyin = Text.open(System.in);
    			//System.out.print("User please key in the arraysize:");
    			BufferedReader user_file = Text.open("CW2Q1_data.txt");
    		}
     
    		void cal_x()
    		{
    				cal_x = ((b-a)*(double)(t)+b+a)/2;
    				return cal_x;
    		 }
     
    		void cal_fx()
    		{
    				cal_fx = Math.pow(x[t],2)*math.sin (x[t])*(b-a)/2;
    				return cal_fx;
    		}
     
    		void cal_sum()
    		{ // this section calculates the sum of a product c*fx
    			double cal_sum(double fx, double c)
    			 sum = 0.0;
    			double cal_sum = sum + (double)(c)*(double)(fx);
     
    		}
    }
     
    }

    here is my code for you.. I reduce some errors ?
    but Still It has an error..
    hope it little bit help you..^^,

  4. The Following User Says Thank You to tina G For This Useful Post:

    JavaPF (March 12th, 2010)

  5. #4
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    Default Re: Please help me with this Java programming

    first let me know what you are trying to do

  6. #5
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    Default Re: Please help me with this Java programming

    i think you just copied some where and posted it here, first you need to know the basics.

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