Java Utililty Methods Number Power

List of utility methods to do Number Power

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Description

The list of methods to do Number Power are organized into topic(s).

Method

longpower(final long x, final long n, final long p)
Return x^n (mod p) Assumes x, n >= 0, p > 0, x < p, 0^0 = 1 Overflow may occur if p > 31 bits. 
if (n == 0)
    return 1;
long tmp = power((x * x) % p, n / 2, p);
if (n % 2 != 0)
    tmp = (tmp * x) % p;
return tmp;
intpower(int base, int power)
Returns the integer result of base^power 
int result = 1;
int absPower = Math.abs(power);
for (int p = 0; p < absPower; p++) {
    result *= base;
if (power < 0) {
    result = 1 / result;
return result;
intpower(int i)
Calculates 2 to the power i as a helper in determining timings for some of the operations. 
if (i <= 0) {
    return 1;
} else if (i == 1) {
    return 2;
} else if (i == 2) {
    return 4;
} else if (i > 32) {
    return Integer.MAX_VALUE;
...
intpower(int val, int numOfPower)
power 
for (int i = 0; i < numOfPower; i++) {
    val *= 10;
return val;
intpower(int x, int n)
Returns x to the power n. 
return (int) (Math.pow(x, n));
longpower(long x, long y)
The power function for long arguments. 
if (y < 0)
    throw new ArithmeticException("power to a negative integer is not sensible here.");
long r = 1;
for (long i = 0; i < y; i++)
    r *= x;
return r;
longpower2(int power)
Calculating the number 2 ^ stated figure, used by itob function to convert decimal / binary 
long integer = 1;
for (int i = 0; i < power; i++) {
    integer *= 2;
return integer;
intpowerConverter(String _varSymbol)
Converts a unit prefix to power of base 10. 
if (_varSymbol == null || _varSymbol.length() < 2) {
    return 0;
if (_varSymbol.startsWith("d")) {
    return -1;
} else if (_varSymbol.startsWith("c")) {
    return -2;
} else if (_varSymbol.startsWith("m") && _varSymbol.length() > 1) {
...
doublepowerLevelToDb(double value)
power Level To Db 
return 10.0 * Math.log10(value);
doublepowerLevelToDb0(double value)
power Level To Db 
double result = powerLevelToDb(value);
if (result < MIN_GAIN)
    return MIN_GAIN;
return result;