thebbqcode

class Power
{
	void run()
	{
 
		System.out.println("Program to compute a number a to the power of b\nTrial Values will be 5^0, 5^1 and 5^2, 5^3\nEnjoy\n\n");
 
		//series of test values
 
        //Values are of type double, hence for Elements format to 0 decimal places
		System.out.println("(5,0) = " + String.format("%.0f",determinePower(5,0)) ); 
		System.out.println("(5,1) = " + String.format("%.0f",determinePower(5,1)) );
		System.out.println("(5,2) = " + String.format("%.0f",determinePower(5,2)) );
		System.out.println("(5,3) = " + String.format("%.0f",determinePower(5,3)) );
		System.out.println();
 
		//for negative bases and powers set decimal places longer i.e "%.4f" for four places
		System.out.println("(5,-1) = " + String.format("%.4f",determinePower(5,-1)) );
		System.out.println("(5,-3) = " + String.format("%.4f",determinePower(5,-3)) );
		System.out.println("(-1,1) = " + String.format("%.4f",determinePower(-1,1)) );
		System.out.println("(-2,2) = " + String.format("%.4f",determinePower(-2,2)) );
		System.out.println("(-2,3) = " + String.format("%.4f",determinePower(-2,3)) );
		System.out.println("(-1,0) = " + String.format("%.4f",determinePower(-1,0)) );
		System.out.println();
 
		System.out.println("(-2,-2) = " + String.format("%.4f",determinePower(-2,-2)) );
	}
 
    // Function to Determine the power of a base and power
	double determinePower(double base, double power)
	{
		double answer = 1;		
 
        // Any base to power of zero == 1
		if (power == 0)
		return 1;
 
        // Any base to the power of one is equal to the base
		else if (power == 1)		
		return base;
 
        // Iterative loop to compute all other values. Assuming
        // values >= 0
		else if (power > 1)
        {
			for(int i = 1; i <= power; i++)
			{
				answer *= base;
			}
			return answer;
        }
 
        else if (power == -1)
        {
        	return 1 / base;
        }
 
        //handle negative powers
        else if (power < 0)
        {  	
        	double absolutePower = -power;	// make power a positive value
        									// for the sake of iteration.
        									// can be left negative - for loop 
        									// would need modification
 
        	for (int k = 0; k < absolutePower; k++)
        	{
        		answer *= base;
        	}
        	return (1 / answer);
        }
 
        else return -1;
	}
 
	public static void main(String[] args)
	{
		Power myPower = new Power();
		myPower.run();
	}
 
 
}