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Thread: help make trig values tables by using while or for loops

  1. #1
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    Default help make trig values tables by using while or for loops

    My assignment is Write a static void method called printTrigTables that prints the sin, cos, and tan of angles
    ////between 0 and 360 in increments of 30 degrees. The first column should be the angle size,
    //and the next three columns should be the sin, cos, and tan. Use either a while loop or a for
    //loop. One problem you will encounter however is that the Math functions for sin, cos, and
    //tan take radians, not degrees! So, you must convert your angle to radians first. Here is the
    //formula for degree to radian conversion:
    //radians = degrees x PI / 180.

    public static double degConvert(double degrees){ // converts to degrees
    double radians = degrees * (Math.PI/180);
    return radians;
    }

    For the trig table, can anyone help me make a method, or several encapsulated methods that do the following:

    Count from 0 to 360 by 30's, using a loop; convert those numbers into radians using the equation x*pi/180; take all of those values and put them into Math.sin(); print.

    public static void printTrigTables () {
     
     double a1, a2, a3,a4,a5, a6, a7,a8,a9,a10,a11,a12;4
     System.out.println ("degree, sin, cos, tan");
     double degree;
            System.out.print("Angle 30 degree ");
            a1 = 30 * Math.PI/180;
            System.out.println ("cos(" + a1 + ") is " + Math.acos(a1));
            System.out.println ("sin(" + a1 + ") is " + Math.asin(a1));
            System.out.println("tan(" + a1 + ") is " + Math.atan(a1));
            System.out.print("Angle 60 degree ");
            a2 = 60 * Math.PI/180;
            System.out.println("cos(" + a2 + ") is " + Math.acos(a2)) ;
            System.out.println("sin(" + a2 + ") is " + Math.asin(a2));
            System.out.println("tan(" + a2 + ") is " + Math.atan(a2));
            System.out.print("Angle 90 degree ");
            a3 = 90 * Math.PI/180;
            System.out.println("cos(" + a3 + ") is " + Math.acos(a3)) ;
            System.out.println("sin(" + a3 + ") is " + Math.asin(a3));
            System.out.println("tan(" + a3 + ") is " + Math.atan(a3));
            System.out.print("Angle 120 degree ");
            a4 = 120 * Math.PI/180;
            System.out.println("cos(" + a4 + ") is " + Math.acos(a4));
            System.out.println("sin(" + a4 + ") is " + Math.asin(a4));
            System.out.println("tan(" + a4 + ") is " + Math.atan(a4));
            System.out.print("Angle 150 degree ");
            a5 = 150 * Math.PI/180;
            System.out.println("cos(" + a5 + ") is " + Math.acos(a5));
            System.out.println("sin(" + a5 + ") is " + Math.asin(a5));
            System.out.println("tan(" + a5 + ") is " + Math.atan(a5));
            System.out.print("Angle 180 degree ");
            a6 = 180 * Math.PI/180;
            System.out.println("cos(" + a6 + ") is " + Math.acos(a6));
            System.out.println("sin(" + a6 + ") is " + Math.asin(a6));
            System.out.println("tan(" + a6 + ") is " + Math.atan(a6));
            System.out.print("Angle 210 degree ");
            a7 = 210 * Math.PI/180;
            System.out.println("cos (" + a7 + ") is " + Math.acos(a7));
            System.out.println("sin (" + a7 + ") is " + Math.asin(a7));
            System.out.println("tan (" + a7 + ") is " + Math.atan(a7));
            System.out.print("Angle 240 degree ");
            a8 = 240 * Math.PI/180;
            System.out.println("cos (" + a8 + ") is " + Math.acos(a8));
            System.out.println("sin (" + a8 + ") is " + Math.asin(a8));
            System.out.println("tan (" + a8 + ") is " + Math.atan(a8));
            System.out.print("Angle 270 degree ");
            a9 = 270 * Math.PI/180;
            System.out.println("cos (" + a9 + ") is " + Math.acos(a9));
            System.out.println("sin (" + a9 + ") is " + Math.asin(a9));
            System.out.println("tan (" + a9 + ") is " + Math.atan(a9));
            System.out.print("Angle 300 degree ");
            a10 = (300 * Math.PI)/180;
            System.out.println("cos (" + a10 + ") is " + Math.acos(a10));
            System.out.println("sin (" + a10 + ") is " + Math.asin(a10));
            System.out.println("tan (" + a10 + ") is " + Math.atan(a10));
            System.out.print("Angle 330 degree ");
            a11 = (330 * Math.PI)/180;
            System.out.println("cos (" + a11 + ") is " + Math.acos(a11));
            System.out.println("sin (" + a11 + ") is " + Math.asin(a11));
            System.out.println("tan (" + a11 + ") is " + Math.atan(a11));
            System.out.print("Angle 360 degree ");
            a12 = (360 * Math.PI)/180;
            System.out.println("cos (" + a12 + ") is " + Math.acos(a12));
            System.out.println("sin (" + a12 + ") is " + Math.asin(a12));
            System.out.println("tan (" + a12 + ") is " + Math.atan(a12));
        }                                              
     
     }

    I don't know how to put a while or for loop into the program so the 1st column is the angle measure, the 2,3,and 4th columns are the trig values....Help me please!


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: help make trig values tables by using while or for loops

    You would use a loop to print out the rows. The data on a row (the columns) would be built in a String and printed using a println() statement.

    Can you post a sample of the output you are trying to create?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: help make trig values tables by using while or for loops

    System.out.println("Degree\tSin\t\tCos\t\tTan");
         int i = 0;
    	  String str = "";
        for (int degree = 0; degree <= 360; degree += 30) {
    	 if (i == 0)
    	{  str = String.format("%3d\t%6.4f\t\t%6.4f\t\t%6.4f\n",  degree,
            Math.sin(degree * Math.PI / 180),
            Math.cos(degree * Math.PI / 180),
            Math.tan(degree * Math.PI / 180));
    		  }
    		  else
    		  {
    		  str = str + "\n" + String.format("%3d\t%6.4f\t\t%6.4f\t\t%6.4f\n",  degree,
            Math.sin(degree * Math.PI / 180),
            Math.cos(degree * Math.PI / 180),
            Math.tan(degree * Math.PI / 180));
     
    		  }
    		  i++;
     
        System.out.printf("%3d\t%6.4f\t\t%6.4f\t\t%6.4f\n", degree,
            Math.sin(degree * Math.PI / 180),
            Math.cos(degree * Math.PI / 180),
            Math.tan(degree * Math.PI / 180));
     
        }}}
    My problem now is that I do not understand how %3d\t%6.4f\t\t%6.4f\t\t%6.4f\n makes the trig values work....Also, for the tan values at 90 and 270 are supposed to be undefined, but when I run it, I get a gigantic number.

  4. #4
    Super Moderator curmudgeon's Avatar
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    Default Re: help make trig values tables by using while or for loops

    It looks like you're borrowing code that you don't yet understand. Where did you get this code from?

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: help make trig values tables by using while or for loops

    I do not understand how %3d\t%6.4f\t\t%6.4f\t\t%6.4f\n makes the trig values work
    Those %xxx things are formatting instructions to the format() method of the String class. Read the API doc for that method to see what they mean. The \t is the tab character that is used by the console to move the following String to the next tab position on the screen.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: help make trig values tables by using while or for loops

    Note that if you check out the PrintSream#printf(...) API, it will direct you to the java.util.Formatter API. As Norm states, it's all explained there.

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    Default Re: help make trig values tables by using while or for loops

    This is the output I need, but the tan of 90 and 270 made vary because they are supposed to be undefined. I added the tan into the code.

    Degree	Sin		Cos		Tan
      0	0.0000		1.0000		0.0000
     30	0.5000		0.8660		0.5774
     60	0.8660		0.5000		1.7321
     90	1.0000		0.0000		16331239353195370.0000
    120	0.8660		-0.5000		-1.7321
    150	0.5000		-0.8660		-0.5774
    180	0.0000		-1.0000		-0.0000
    210	-0.5000		-0.8660		0.5774
    240	-0.8660		-0.5000		1.7321
    270	-1.0000		-0.0000		5443746451065123.0000
    300	-0.8660		0.5000		-1.7321
    330	-0.5000		0.8660		-0.5774
    360	-0.0000		1.0000		-0.0000

    Is there a link you can provide?
    Last edited by Norm; March 9th, 2013 at 06:43 PM. Reason: Added code tags to show formatting

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