// File: Java_ACM_misc.java
//
// Author: Robert W. Lindeman, with help from Rahul Simha.
// Created: 10/31/2001
//
// A package of useful I/O functions for the ACM.
// See the main function below for examples of use.

import java.io.*;
import java.util.*;
import java.text.*;
import java.lang.Math.*;

public class Acm_misc {
    public static double M_PI = 3.14159265358979323846;

    public static boolean numeric( char c )
    { return( (c) >= '0' && (c) <= '9' ); }
    public static double abs( double x )
    { return( (x) < 0 ? -(x) : (x) ); }

    public static double min( double a, double b )
    { return( (a) < (b) ? (a) : (b) ); }
    public static double max( double a, double b )
    { return( (a) > (b) ? (a) : (b) ); }

    public static double deg( double rad )    /* Rad to Deg. */
    { return( ( (rad) * 180.0 ) / (Acm_misc.M_PI) ); }
    public static double rad( double deg )          /* Deg to Rad. */
    { return( ( (deg) / 180.0 ) * (Acm_misc.M_PI) ); }

    public static double dist2d( double x1, double y1, double x2, double y2 )
    { return( Math.sqrt( ( ( (x1) - (x2) ) * ( (x1) - (x2) ) ) +
			 ( ( (y1) - (y2) ) * ( (y1) - (y2) ) ) ) ); }
    public static double dist3d( double x1, double y1, double z1,
				 double x2, double y2, double z2 )
    { return( Math.sqrt( ( ( (x1) - (x2) ) * ( (x1) - (x2) ) ) +
			 ( ( (y1) - (y2) ) * ( (y1) - (y2) ) ) +
			 ( ( (z1) - (z2) ) * ( (z1) - (z2) ) ) ) ); }

    // Bit Tests: Returns 'true' if bit 'b' is set (clear) in integer 'i'.
    public static boolean bit_set( int i, int b )
    { return( ( ( (i) & ( 1 << (b) ) ) >> (b) ) != 0 ); }
    public static boolean bit_clear( int i, int b )
    { return( (!bit_set( (i), (b) )) ); }

    // Bit Sets: Returns 'i' with bit 'b' set (clear).
    public static int set_bit( int i, int b )
    { return( ( (i) | ( 1 << (b) ) ) ); }
    public static int clear_bit( int i, int b )
    { return( ( (i) & ~( 1 << (b) ) ) ); }
    public static int toggle_bit( int i, int b )
    { return( ( (i) ^ ( 1 << (b) ) ) ); }

    public static void main( String[] argv ) {
	System.out.println( "Testing macros..." );
	System.out.println( "  abs( -100 ): " + Acm_misc.abs( -100 ) );
	System.out.println( "  min( 50.1, 100 ): " + Acm_misc.min( 50.1, 100 ) );
	System.out.println( "  max( 50.1, 50.2 ): " + Acm_misc.max( 50.1, 50.2 ) );
	System.out.println( "  deg( " + Acm_misc.M_PI + " ): " + Acm_misc.deg( Acm_misc.M_PI ) );
	System.out.println( "  rad( 180.0 ): " + Acm_misc.rad( 180.0 ) );
	System.out.println( "  Dist2d (should be 5): " +
			    Acm_misc.dist2d( 0.0, 0.0, 4.0, 3.0 ) );
	System.out.println( "  Dist3d (should be 5): " +
			    Acm_misc.dist3d( 0.0, 0.0, 0.0, 4.0, 3.0, 0.0 ) );
	System.out.println( "  Acm_misc.bit_set(  3, 0 ) (should be true): " +
			    Acm_misc.bit_set( 3, 0 ) );
	System.out.println( "  Acm_misc.bit_set(  2, 1 ) (should be true): " +
			    Acm_misc.bit_set( 2, 1 ) );
	System.out.println( "  Acm_misc.bit_set( 54, 0 ) (should be true): " +
			    Acm_misc.bit_set( 54, 0 ) );
	System.out.println( "  Acm_misc.bit_set( Acm_misc.set_bit( 0, 4 ), 4 ) (should be true): " +
			    Acm_misc.bit_set( Acm_misc.set_bit( 0, 4 ), 4 ) );
	System.out.println( "  Acm_misc.bit_set( Acm_misc.clear_bit( 0, 4 ), 4 ) (should be false): " +
			    Acm_misc.bit_set( Acm_misc.clear_bit( 0, 4 ), 4 ) );
	System.out.println( "  Acm_misc.bit_set( Acm_misc.toggle_bit( 6, 2 ), 2 ) (should be false): " +
			    Acm_misc.bit_set( Acm_misc.toggle_bit( 6, 2 ), 2 ) );
	System.out.println( );
    }
} // End of class "Acm_misc"