Power of a Number in JavaIn this section, we will write Java programs to determine the power of a number. To get the power of a number, multiply the number by its exponent. Example: Assume the base is 5 and the exponent is 4. To get the power of a number, multiply it by itself four times, i.e. (5 * 5 * 5 * 5 = 625). How to Determine the Power of a Number?
Methods to Find the Power of a NumberThere are several methods for determining a number's power:
1. Using Java for LoopA for loop may be used to compute the power of a number by multiplying the base by itself repeatedly. PowerOfNumber1.java Output: 2 raised to the power of 3 is 8 2. Using Java while LoopA while loop may similarly be used to achieve the same result by multiplying the base many times. PowerOfNumber2.java Output: 2 raised to the power of 3 is 8 3. Using Recursion:Recursion is the process of breaking down an issue into smaller subproblems. Here's an example of how recursion may be used to compute a number's power. PowerOfNumber3.java Output: 2 raised to the power of 3 is 8 4. Using Math.pow() MethodThe java.lang package's Math.pow() function computes the power of an integer directly. PowerOfNumber4.java Output: 2.0 raised to the power of 3.0 is 8.0 Handling Negative Exponents:When dealing with negative exponents, the idea of reciprocal powers might be useful. For instance, x^(n) equals 1/x^n. Here's an example of dealing with negative exponents. PowerOfNumber5.java Output: 2.0 raised to the power of 3 is: 0.125 Optimizing for Integer Exponents:When dealing with integer exponents, you may optimize the calculation by iterating only as many times as the exponent value. It decreases the number of unneeded multiplications. PowerOfNumber6.java Output: 2.0 raised to the power of 4 is: 16.0 5. Using Bit Manipulation to Calculate Binary Exponents:Bit manipulation can be used to better improve integer exponents. To do fewer multiplications, an exponent's binary representation might be used. PowerOfNumber7.java Output: 2.0 raised to the power of 5 is: 32.0
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