Java Guava | factorial(int n) method of IntMath Class with Examples
Last Updated :
19 Sep, 2023
The factorial(int n) method of Guava’s IntMath Class returns the product of the first n positive integers, which is n!.
Syntax:
public static int factorial(int n)
Parameter: The method accepts only one parameter n which is of integer type and is to be used to find the factorial.
Return Value: This method return following values:
- This method returns 1 if n is 0.
- This method returns product of the first n positive integers if the result fits in a int.
- This method returns Integer.MAX_VALUE if the result does not fit in a int.
Exceptions: The method factorial(int n) throws IllegalArgumentException if n is negative.
Example 1:
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
public static void main(String args[])
{
int n1 = 10 ;
int ans1 = IntMath.factorial(n1);
System.out.println( "factorial of "
+ n1 + " is : "
+ ans1);
int n2 = 12 ;
int ans2 = IntMath.factorial(n2);
System.out.println( "factorial of "
+ n2 + " is : "
+ ans2);
}
}
|
Output:
factorial of 10 is : 3628800
factorial of 12 is : 479001600
Example 2 :
import java.math.RoundingMode;
import com.google.common.math.IntMath;
class GFG {
static int findFact( int n)
{
try {
int ans = IntMath.factorial(n);
return ans;
}
catch (Exception e) {
System.out.println(e);
return - 1 ;
}
}
public static void main(String args[])
{
int n = - 5 ;
try {
findFact(n);
}
catch (Exception e) {
System.out.println(e);
}
}
}
|
Output:
java.lang.IllegalArgumentException: n (-5) must be >= 0
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