Java Write a static recursive method named frequencyCount(n,d) that returns the

Question

Java

Write a static recursive method named frequencyCount(n,d) that returns the frequency of occurrence of a particular digit d in an integer n. For example, frequencyCount(1342457,4) returns 2,

but frequencyCount(1342457,6) returns 0.

The method frequencyCount(n,d) may not use local variables or static variables.

Create a project named Project7 containing a class named Program7 which contains the main method for this application as well as the method frequencyCount. The main method for this application reads in an integer n as well as a digit d and then calls the method frequencyCount to output the result on the screen.

Explanation / Answer

FrequencyCountTest.java

public class FrequencyCountTest {

  
   public static void main(String[] args) {
   System.out.println(frequencyCount(1342457,6));
System.out.println(frequencyCount(1342457,4) );
   }
   public static int frequencyCount(int n, int searchDigit){
       if(n == 0){
           return 0;
       }
       else{
           if(n % 10 == searchDigit){
               return 1 + frequencyCount(n/10, searchDigit);
           }
           else{
               return frequencyCount(n/10, searchDigit);
           }
       }
   }
}

Output:

0

2

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