Question

How to implement a power function in Java

Answer 1

public class MyClass {
    public static long power(int x, int y) {
        long result = x;
    
        for (int i = 1; i < y; i++) {
          result = result * x;
        }
        
        return result;
    }
    public static void main(String args[]) {
        System.out.println("2 power 3 : = " + power(2, 3));
        System.out.println("3 power 3 : = " + power(3, 3));
        System.out.println("2 power 4 : = " + power(2, 4));
        System.out.println("5 power 2 : = " + power(5, 2));
    }
}

 
 
 
 
/*
run:
 
2 power 3 : = 8
3 power 3 : = 27
2 power 4 : = 16
5 power 2 : = 25
 
*/

 

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Answer 2

public class PowerCalculation {
    // Method to compute integer exponentiation
    public static double myPow(double base, int exponent) {
        double result = 1;
 
        while (exponent > 0) {
            if ((exponent & 1) == 1) {
                result *= base;
            }
            exponent >>= 1;
            base *= base;
        }
 
        return result;
    }
 
    public static void main(String[] args) {
        // Testing the function
        System.out.println(myPow(2, 3));  // 8
        System.out.println(myPow(3, 3));  // 27
        System.out.println(myPow(3, 2));  // 9
        System.out.println(myPow(2, 2));  // 4
        System.out.println(myPow(5, 2));  // 25
        System.out.println(myPow(-2, 4)); // 16
    }
}
 
 
/*
run:
 
8.0
27.0
9.0
4.0
25.0
16.0
 
*/

 

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