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Fixed small warning

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Ziver Koc 2017-11-01 16:25:58 +01:00
parent 8455ba5a43
commit c344856989
1 changed files with 65 additions and 65 deletions
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130
src/zutil/math/ZMath.java Normal file → Executable file
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@ -32,70 +32,70 @@ import java.math.BigInteger;
* @author Ziver
*/
public class ZMath {
/**
* Calculates the percentage of the values
*/
public static double percent(int min, int max, int value){
return ((double)(value-min)/(max-min))*100;
}
/**
* Solves the equation: x^2 + px + q = 0
*
* @return the two values of x as an array
*/
public static double[] pqFormula(double p, double q){
double[] ret = new double[2];
double t = (p/2);
ret[0] = Math.sqrt( t*t - q );
ret[1] = -ret[0];
t *= -1;
ret[0] += t;
ret[1] += t;
return ret;
}
/**
* Solves the equation: x^2 + px + q = 0.
* WARNING: This uses only BigInteger, thereby removing the decimals in the calculation
*
* @return the two values of x as an array
*/
public static BigInteger[] pqFormula(BigInteger p, BigInteger q){
BigInteger[] ret = new BigInteger[2];
BigInteger t = p.divide( BigInteger.valueOf(2) );
ret[0] = ZMath.sqrt( t.multiply( t ).subtract( q ) );
ret[1] = ret[0].negate();
t = t.negate();
ret[0] = ret[0].add( t );
ret[1] = ret[1].add( t );
return ret;
}
/**
* Calculates the square root of a big number
*
*/
public static BigInteger sqrt(BigInteger value){
BigInteger op = value;
BigInteger res = BigInteger.ZERO;
BigInteger one = BigInteger.ONE;
while( one.compareTo( op ) < 0 ){
one = one.shiftLeft( 2 );
}
one = one.shiftRight(2);
while( !one.equals( BigInteger.ZERO ) ){
if( op.compareTo( res.add( one ) ) >= 0 ){
op = op.subtract( res.add( one ) );
res = res.add( one.shiftLeft( 1 ) );
}
res = res.shiftRight( 1 );
one = one.shiftRight( 2 );
}
return res;
}
/**
* Calculates the percentage of the values
*/
public static double percent(int min, int max, int value){
return ((double)(value-min)/(max-min))*100;
}
/**
* Solves the equation: x^2 + px + q = 0
*
* @return the two values of x as an array
*/
public static double[] pqFormula(double p, double q){
double[] ret = new double[2];
double t = (p/2);
ret[0] = Math.sqrt( t*t - q );
ret[1] = -ret[0];
t *= -1;
ret[0] += t;
ret[1] += t;
return ret;
}
/**
* Solves the equation: x^2 + px + q = 0.
* WARNING: This uses only BigInteger, thereby removing the decimals in the calculation
*
* @return the two values of x as an array
*/
public static BigInteger[] pqFormula(BigInteger p, BigInteger q){
BigInteger[] ret = new BigInteger[2];
BigInteger t = p.divide( BigInteger.valueOf(2) );
ret[0] = sqrt( t.multiply( t ).subtract( q ) );
ret[1] = ret[0].negate();
t = t.negate();
ret[0] = ret[0].add( t );
ret[1] = ret[1].add( t );
return ret;
}
/**
* Calculates the square root of a big number
*
*/
public static BigInteger sqrt(BigInteger value){
BigInteger op = value;
BigInteger res = BigInteger.ZERO;
BigInteger one = BigInteger.ONE;
while( one.compareTo( op ) < 0 ){
one = one.shiftLeft( 2 );
}
one = one.shiftRight(2);
while( !one.equals( BigInteger.ZERO ) ){
if( op.compareTo( res.add( one ) ) >= 0 ){
op = op.subtract( res.add( one ) );
res = res.add( one.shiftLeft( 1 ) );
}
res = res.shiftRight( 1 );
one = one.shiftRight( 2 );
}
return res;
}
}