# Java Guava | LongMath.checkedPow(long b, int k) method with Examples

checkedPow(long b, long k) is a method of Guava’s LongMath Class which accepts two parameters b and k and is used to find the k-th power of b.

Syntax:

public static long checkedPow(long b, long k)

Parameters: The method accepts two parameters, b and k. The parameter b is called base which is raised to the k-th power.

Return Value: This method returns the k-th power of b.

Exceptions: The method checkedPow(long b, long k) throws ArithmeticException if the k-th power of b overflows in signed long arithmetic.

Below examples illustrate the implementation of the above method:

Example 1:

 // Java code to show implementation of // checkedPow(long b, long k) method of // Guava's LongMath class    import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        // Driver code     public static void main(String args[])     {         long b1 = 5;         int k1 = 7;            // Using checkedPow(long b, long k) method         // of Guava's LongMath class         long ans1 = LongMath.checkedPow(b1, k1);            System.out.println(b1 + " to the "                            + k1 + "th power is: "                            + ans1);            long b2 = 19;         int k2 = 4;            // Using checkedPow(long b, long k) method         // of Guava's LongMath class         long ans2 = LongMath.checkedPow(b2, k2);            System.out.println(b2 + " to the " + k2                            + "th power is: "                            + ans2);     } }

Output:

5 to the 7th power is: 78125
19 to the 4th power is: 130321

Example 2:

 // Java code to show implementation of // checkedPow(long b, long k) method of // Guava's LongMath class    import java.math.RoundingMode; import com.google.common.math.LongMath;    class GFG {        static long findPow(long b, int k)     {         try {                // Using checkedPow(long b, long k) method of             // Guava's LongMath class             // This should raise "ArithmeticException" as             // b to the kth power overflows in             // signed long arithmetic             long ans = LongMath.checkedPow(b, k);                // Return the answer             return ans;         }         catch (Exception e) {             System.out.println(e);             return -1;         }     }        // Driver code     public static void main(String args[])     {         long b = 20;         int k = 25;            try {                // Function calling             findPow(b, k);         }         catch (Exception e) {             System.out.println(e);         }     } }

Output:

java.lang.ArithmeticException: overflow

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