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Thread: Loop help!
 09212013, 12:46 AM #1Member
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Loop help!
Hi, I'm quite new to programming and Java. I need some help with my homework. The problem is in the image below:
And here is my code so far:
Java Code:// Duy Nguyen (ID:02104267) // Duy Nguyen (ID:02104267) public class Points { public static void main( String[] args ){ // Input check if( args.length != 7 ){ System.err.println( "ERROR: invalid number of command line " + "inputs." ); System.err.println( "Usage: points X1 Y1 X2 Y2 X3 Y3 N" ); System.exit( 1 );} // Command line input double x1= Double.parseDouble(args[0]); double y1= Double.parseDouble(args[1]); double x2= Double.parseDouble(args[2]); double y2= Double.parseDouble(args[3]); double x3= Double.parseDouble(args[4]); double y3= Double.parseDouble(args[5]); double n= Double.parseDouble(args[6]); // Distance+ line double distance= Math.sqrt(Math.pow(x1 x2, 2) + Math.pow(y1 y2, 2)); double slope= (y2y1)/(x2x1); // Points int i= 1; System.out.printf("The distance from(%.2f, %.2f) to (%.2f, %.2f) is: %f ", x1, y1, x2, y2, distance); double xi, yi; for(i=1; i<= n; i++) { xi= (x2/n)+ x1; yi= (y2/n)+ y1; System.out.printf("%.2f, %.2f", xi, yi) } } } }
Last edited by huuduy216; 09212013 at 12:59 AM.
 09232013, 08:51 AM #2Senior Member
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Re: Loop help!
You see that float you're using to display the %f placeholder value? Declare another variable to store the smallest of those, as well as another variable to store the index of the args array corresponding to that value, then simply use that index variable to display the point directly out of the args array.
 09232013, 11:36 AM #3
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Re: Loop help!
Also, don't try to calculate the slope; it isn't defined if P1 and P2 are the endpoints of a vertical line segment (x2 == x1). Note that if you walk over the points of the line, if the distance of a point is larger than the distance of the previous point, the previous point has the minimal distance to that fixed third point.
kind regards,
Joscenosillicaphobia: the fear for an empty beer glass
 09232013, 03:43 PM #4Member
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Re: Loop help!
This is what I came up with.
Java Code:// Duy Nguyen (ID:02104267) // Duy Nguyen (ID:02104267) public class Points { public static void main( String[] args ){ // Input check if( args.length != 7 ){ System.err.println( "ERROR: invalid number of command line " + "inputs." ); System.err.println( "Usage: points X1 Y1 X2 Y2 X3 Y3 N" ); System.exit( 1 );} // Command line input double x1= Double.parseDouble(args[0]); double y1= Double.parseDouble(args[1]); double x2= Double.parseDouble(args[2]); double y2= Double.parseDouble(args[3]); double x3= Double.parseDouble(args[4]); double y3= Double.parseDouble(args[5]); double n= Double.parseDouble(args[6]); // Distance+ line double distance= Math.sqrt(Math.pow(x1 x2, 2) + Math.pow(y1 y2, 2)); // Points int i1= 1; int i2= 1; System.out.printf("The distance from(%.2f, %.2f) to (%.2f, %.2f) is: %f \n", x1, y1, x2, y2, distance); double xi= x1; double yi= y1; double closestDistance= Math.sqrt(Math.pow(xi x3, 2) + Math.pow(yi y3, 2)); int closesti= 0; //hold the number i2 that has shortest distance for(i1=1; i1<=n;i1++) { if (i1== closesti) { System.out.printf("(%.2f, %.2f) < Closest point to (%.2f,%.2f)\n", xi, yi, x3, y3); } else { System.out.printf("(%.2f, %.2f)\n", xi, yi); } for(i2=1; i2<= n; i2++) { xi+= (x2x1)/10; yi+= (y2y1)/10; if(Math.sqrt(Math.pow(xi x3, 2) + Math.pow(yi y3, 2)) <= closestDistance) { closestDistance= Math.sqrt(Math.pow(xi x3, 2) + Math.pow(yi y3, 2)); closesti= i2; } } } } }
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