ASMR Coding #9 source code

public class CodingProblems {


  public static void main(String[] args) {



    System.out.println("TESTING SOLUTION TO PROBLEM #1");

    System.out.println(accum("abcd"));

    System.out.println("TESTING SOLUTION TO PROBLEM #2");
    // 00000000 10101010 11111111

    //expected:
    // 11111111 10101010 00000000
    int[] testdata = new int[]{1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,0,1,0,1,0,1,0};

    printByteArray(testdata);
    System.out.println();
    printByteArray(reverseData(testdata));

  }


  //problem 1 attempt successful!

  public static String accum(String mumble) {

    String mumbled = "";

    //outer 4 loop to loop ever single letter in the string input
    for (int i = 0; i < mumble.length(); i++) {

      //inner 4 loop: each letter has to be repeated 1 more than the precious
      for (int j = 0; j <= i; j++) {

        if (j == 0) {
          //concactinate a capital letter if its the first letter in a repeat series
          mumbled += mumble.toUpperCase().charAt(i);
        }
        else {
          mumbled += mumble.toLowerCase().charAt(i);
        }
      }

      if (i != mumble.length() - 1) {
        mumbled += "-";
      }
    }

    return mumbled;
  }



  //problem 2 attempt successful
  public static int[] reverseData(int[] data) {

    int[] reversedData = new int[data.length];
    int nextPos = 0;

    //data validation
    if (data.length % 8 != 0) {
      System.out.println("invalid data");
      return new int[]{-1};
    }
    // loop through every group of 8 bits, starting from the end of the array

    // 00000000 11111111 00000000
    for (int i = data.length - 1; i >= 0; i = i - 8) {

      // inner 4 loop that inserts a new bit/byte of that group, starting from the left

      //10101010 10101010
      for (int j = i-7; j <= i; j++) {

        //add in the next bit in the reversed data array
        //loop begins j = i-7
        //loop ends j = i
        reversedData[nextPos] = data[j];
        nextPos++;
      }

    }

    return reversedData;
  }

  //print int arrays
  public static void printByteArray(int[] x) {
    for (int i = 0; i < x.length; i++) {
      System.out.print(x[i]);

      //every 8th value, print a space to separate the groups of 8 bits
      if ((i+1) % 8 == 0) {
        System.out.print(" ");
      }
    }
  }
}