Write a recursive method that converts a positive decimal number to into a binary number as a string. The method header is: String decimalToBinary(int value) //Note: Print empty string ", if value is negative or zero. Input 2 Output 10
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***********************Answer question below:******
Write code in Java:
- Make sure code is recursive.
- Do not change code other than where it says you can.
import java.util.*;
import java.lang.*;
import java.io.*;
class DecimalToBinary {
public static String decimalToBinary(int value) {
//*Code goes here*
}
}
class DriverMain {
public static void main(String args[]) {
Scanner input = new Scanner(System.in);
System.out.print(DecimalToBinary.decimalToBinary(input.nextInt()));
}
}
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- Write a recursive method that for a positive integer returns a string with commas in the appropriate places, for example, putCommas(1234567) returns the string “1,234,567.”Write a recursive method called reverseString() that takes in a string as a parameter and returns the string in reversed order. The main method is provided to read a string from the user and call the reverseString() method. Use Java. Ex: If the input of the program is: Hello the reverseString() method returns and the program outputs: Reverse of "Hello" is "olleH". Ex: If the input of the program is: Hello, world! the reverseString() method returns and the program outputs: Reverse of "Hello, world!" is "!dlrow ,olleH". Hint: Move the first character to the end of the returning string and pass the remaining sub-string to the next reverseString() method call. import java.util.Scanner; public class LabProgram { /* TODO: Write recursive reverseString() method here. */public static void main(String[] args) {Scanner scnr = new Scanner(System.in);String input, result;input = scnr.nextLine();result = reverseString(input); System.out.printf("Reverse of \"%s\" is \"%s\".", input, result);}}Write a recursive method oddSum that takes a positive odd integer n and returns the sum of odd integers from 1 to n.
- Write a recursive method thatfinds the number of occurrences of a specified letter in a string using the followingmethod header: public static int count(String str, char a) For example, count("Welcome", 'e') returns 2. Write a test program thatprompts the user to enter a string and a character, and displays the number ofoccurrences for the character in the string.Write a recursive method that parses a binary number as astring into a decimal integer. The method header is public static int bin2Dec(String binaryString) Write a test program that prompts the user to enter a binary string and displaysits decimal equivalent.Write a recursive method called digitCount() that takes two integers, n and m as a parameter and returns the number of digits in n that are equal to m. Assume that n≥0 and 0≤m≤9 Ex: If the input is: 34443215 4 3 import java.util.Scanner; public class LabProgram { /* TODO: Write recursive digitCount() method here. */ public static void main(String[] args) { Scanner scnr = new Scanner(System.in); int digits; int n= scnr.nextInt(); int m= scnr.nextInt(); digits = digitCount(n, m); System.out.println(digits); }}
- Write a recursive method called digitCount() that takes a positive integer as a parameter and returns the number of digits in the integer. Hint: The number of digits increases by 1 whenever the input number is divided by 10. Use Java. Ex: If the input is: 345 the method digitCount() returns and the program outputs: 3 Ex: If the input is: 0 the method digitCount() returns and the program outputs: 1 import java.util.Scanner; public class LabProgram {/* TODO: Write recursive digitCount() method here. */public static void main(String[] args) {Scanner scnr = new Scanner(System.in);int num, digits;num = scnr.nextInt();digits = digitCount(num);System.out.println(digits);}}Write a recursive method to print all the permutations of astring. For example, for the string abc, the permutation isabcacbbacbcacabcba public static void displayPermutation(String s)public static void displayPermutation(String s1, String s2)The first method simply invokes displayPermutation(" ", s). The secondmethod uses a loop to move a character from s2 to s1 and recursively invokesit with new s1 and s2. The base case is that s2 is empty and prints s1 to theconsole.Write a test program that prompts the user to enter a string and displays all itspermutations.Write a short recursive Java method that determines if a string s is a palindrome, that is, it is equal to its reverse. Examples of palindromes include 'racecar' and 'mom'. Test the method by asking the user to provide string entries to be checked. Hint: Check the equality of the first and last characters and recur (but be careful to return the correct value for both odd and even-length strings).
- Write a recursive Java method that calculates the sum of n positive integer numbers. The math function is: f(n) = 1 + 2 + 3 + … + n. Code: public static int Func(int n) { if (n <= 1) return n; return n + Func(n - 1); } Has an error.Write a recursive method that displaysa string reversely on the console using the following header: public static void reverseDisplay(String value) For example, reverseDisplay("abcd") displays dcba. Write a test programthat prompts the user to enter a string and displays its reversal.Write a recursive method called doubleDigits that accepts an integer n as a parameter and returns the integer obtained by replacing every digit of n with two of that digit. For example, doubleDigits(348) should return 334488. The call doubleDigits(0) should return 0. Calling doubleDigits on a negative number should return the negation of calling doubleDigits on the corresponding positive number; for example, doubleDigits(–789) should return –778899.