Question

I faced an interview. where I was asked the following question

Write a function in any of programming language that computes the nth power of a number w/o using + * or ^ or declaring a new variable inside the function or using any library function (eg Math lib in java).

I have used pow function of java Math.pow(a, b)

Thanks

Answer 1

I am using java programming language. The interviewer restricted you to declare a new variable inside the method better you pass it to the function. The interviewer didnt restrict you to use division operator (/) so you can use that.

static double getNthPowerOfNumber(double originalNumber,
        int power) {


    if (power == 0) {
        return 1;
    }
    if (originalNumber == 0) {
        return 0;
    } else {
        originalNumber/=1/getNthPowerOfNumber(originalNumber, --power);

        return originalNumber;
    }



}

if you want to get 5th power of a number 3 then write System.out.println("4..double..." + getNthPowerOfNumber(4, 1));