Question

For a given input value N, find 3^N (Three to the power of N) . You must use a loop! ^_^ (i.e. Don't use Math.pow() if you want full credit in test) getThreeToThePowerOf(0) → 1 getThreeToThePowerOf(1) → 3 getThreeToThePowerOf(3) → 27 getThreeToThePowerOf(0) → 1 getThreeToThePowerOf(1) → 3 getThreeToThePowerOf(2) → 9 public int getThreeToThePowerOf(int N) {    }

Answer 1

import java.util.Scanner;

public class ThreeToThePowerOf {
  
public static void main(String[]args)
{
Scanner sc = new Scanner(System.in);
System.out.print("Enter the exponent value for 3: ");
String userIn = sc.nextLine().trim();
  
while(!isDigit(userIn))
{
System.out.print("\nEnter the exponent value for 3: ");
userIn = sc.nextLine().trim();
}
int exponent = Integer.parseInt(userIn);
  
System.out.println("\nOUTPUT: 3^" + exponent + " = " + getThreeToThePowerOf(exponent) + "\n");
}

/** This method returns 3 raised to the power of N using loop
*
* @param N the exponential value
* @return 3 raised to the power of N
*/
public static int getThreeToThePowerOf(int N)
{
int result = 1;
for(int i = 1; i <= N; i++)
{
result *= 3;
}
return result;
}

/** This method returns TRUE if user input is an integer, else returns FALSE
*
* @param s the user input string
* @return true if the user input gets parsed to integer value, else returns false
*/
public static boolean isDigit(String s)
{
try
{
Integer.parseInt(s);
return true;
}catch(NumberFormatException nfe){
System.out.println(s + " is not a valid integer!");
return false;
}
}
}

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