Question

Write a program that takes a command-line argument n and prints a table of the

powers of 2 that are less than or equal to 2^n.

Answer 1

Answer:

public class PowersOfTwo {

public static void main(String[] args) {

// read in one command-line argument

int n = Integer.parseInt(args[0]);

int i = 0; // count from 0 to N

int powerOfTwo = 1; // the ith power of two

// repeat until i equals n

while (i <= n) {

System.out.println(i + " " + powerOfTwo); // print out the power of two

powerOfTwo = 2 * powerOfTwo; // double to get the next one

i = i + 1;

}

}

}