Introduction : IntMath is used to perform mathematical operations on Integer values. Basic standalone math functions are divided into the classes IntMath, LongMath, DoubleMath, and BigIntegerMath based on the primary numeric type involved. These classes have parallel structure, but each supports only the relevant subset of functions.
Declaration : The declaration for com.google.common.math.IntMath class is :
@GwtCompatible(emulated = true) public final class IntMath extends Object
Below table shows some of the methods provided by IntMath Class of Guava :
Exceptions :
- log2 : IllegalArgumentException if x <= 0
- log10 : IllegalArgumentException if x <= 0
- pow : IllegalArgumentException if k < 0
- sqrt : IllegalArgumentException if x < 0
- divide : ArithmeticException if q == 0, or if mode == UNNECESSARY and a is not an integer multiple of b
- mod : ArithmeticException if m <= 0
- gcd : IllegalArgumentException if a < 0 or b < 0
- checkedAdd : ArithmeticException if a + b overflows in signed int arithmetic
- checkedSubtract : ArithmeticException if a – b overflows in signed int arithmetic
- checkedMultiply : ArithmeticException if a * b overflows in signed int arithmetic
- checkedPow : ArithmeticException if b to the kth power overflows in signed int arithmetic
- factorial : IllegalArgumentException if n < 0
- binomial : IllegalArgumentException if n < 0, k n
Some other methods provided by IntMath Class of Guava are :
Example 1 :
// Java code to show implementation of // IntMath Class of Guava import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
try {
// exception will be thrown as 80 is not
// completely divisible by 3
// thus rounding is required, and
// RoundingMode is set as UNNESSARY
System.out.println(IntMath.divide( 80 , 3 ,
RoundingMode.UNNECESSARY));
}
catch (ArithmeticException ex) {
System.out.println( "Error Message is : " +
ex.getMessage());
}
}
} |
Output :
Error Message is : mode was UNNECESSARY, but rounding was necessary
Example 2 :
// Java code to show implementation of // IntMath Class of Guava import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
// Driver code
public static void main(String args[])
{
// Creating an object of GFG class
GFG obj = new GFG();
// Function calling
obj.examples();
}
private void examples()
{
// As 120 is divisible by 4, so
// no exception is thrown
System.out.println(IntMath.divide( 120 , 4 ,
RoundingMode.UNNECESSARY));
// To compute GCD of two integers
System.out.println( "GCD is : " +
IntMath.gcd( 70 , 14 ));
// To compute log to base 10
System.out.println( "Log10 is : " +
IntMath.log10( 1000 , RoundingMode.HALF_EVEN));
// To compute remainder
System.out.println( "modulus is : " +
IntMath.mod( 125 , 5 ));
// To compute factorial
System.out.println( "factorial is : " +
IntMath.factorial( 7 ));
// To compute log to base 2
System.out.println( "Log2 is : " +
IntMath.log2( 8 , RoundingMode.HALF_EVEN));
// To compute square root
System.out.println( "sqrt is : " +
IntMath.sqrt(IntMath.pow( 12 , 2 ),
RoundingMode.HALF_EVEN));
}
} |
Output :
30 GCD is : 14 Log10 is : 3 modulus is : 0 factorial is : 5040 Log2 is : 3 sqrt is : 12
Reference : Google Guava