Java Program Loops, Frequency Count using loops

Java Program for Loops in Eclipse.

Java assignment

Problem to Solve
This assignment is to solve problem using loops. Write a program to generate 100 random integers in the range of 0 and 99999, find the frequency count of each digit (0, 1, 2, . . . , 9) in these numbers, and print a frequency histogram.
How to Do It
The Overall program structure may look like this:

1. Use ten variables for the frequency counts for the ten digits 0, 1, 2, . . . , 9. 
2. Other variables are also needed. For example, a variable to hold a random number, a variable 
   for the digit, etc. 
3. Repeat 100 times (a loop): 
   
   • Generate a random number. 
   • For each digit d in the number, increase the frequency count of d by 1. This is done 
     using a loop. Note: we do not know how many digits are in the number. 
4. For each digit from 0 to 9 (a loop): 
   • Store its frequency count into a variable.• Display the digit and the frequency count.• Display the horizontal frequency bar of asterisks using a loop. 

To accomplish the task, Here are some suggestions:

1. Generate random integers in the range [0, 99999]. Assume the variable is number: 
   

            number = (int)(Math.random() * 99999);
   

2. Get the digits of the random number. Since we do not know how many digits in the number, you need to use a loop to “peel off” the rightmost digit one at a time using integer division (/) and modulus (%) operations. Here are some example of random numbers and their digits: 

number digits
4028 4028 75 75 66 93540 94540
3. Print a horizontal bar. For each digit (say digit 5) with a frequency count (say 41), a bar is displayed with 41 asterisks like this

         5 (41): *****************************************

The code used for java in Eclipse is

import java.util.Scanner;

public class Enter Your Class Name Here {



 /**

 

  * @param args

  */

 public static void main(String[] args) {

  // TODO Auto-generated method stub



Scanner input = new Scanner(System.in);



   //Declare the Variables

   int count = 0, count0 = 0, count1 = 0, count2 = 0, count3 = 0, count4 = 0, count5 = 0, count6 = 0, count7 = 0, count8 = 0, count9 = 0; 

   int digit1= 1, digit2 = 1, digit3 = 1, digit4 = 1, digit5 = 1;

   int num = 1;



   //Loop

   while (count<100){

    num = (int)(Math.random() * 99999); // to generate a random number

    count++;



   //Break Numbers

    digit1 = num / 10;

    digit2 = (num % 10000) / 1000;

    digit3 = ((num % 10000) % 1000) / 100;

    digit4 = (((num % 10000) % 1000) % 100) / 10;

    digit5 = ((((num % 10000) % 1000) % 100) % 10);



    if(digit1 == 0 || digit2 == 0 || digit3 == 0 || digit4 == 0 || digit5 == 0){

     count0 = count0 +1;}

    if(digit1 == 1 || digit2 == 1 || digit3 == 1 || digit4 == 1 || digit5 == 1){

     count1 = count1 +1;}

    if(digit1 == 2 || digit2 == 2 || digit3 == 2 || digit4 == 2 || digit5 == 2){

     count2 = count2 +1;}

    if(digit1 == 3 || digit2 == 3 || digit3 == 3 || digit4 == 3 || digit5 == 3){

     count3 = count3 +1;}

    if(digit1 == 4 || digit2 == 4 || digit3 == 4 || digit4 == 4 || digit5 == 4){

     count4 = count4 +1;}

    if(digit1 == 5 || digit2 == 5 || digit3 == 5 || digit4 == 5 || digit5 == 5){

     count5 = count5 +1;}

    if(digit1 == 6 || digit2 == 6 || digit3 == 6 || digit4 == 6 || digit5 == 6){

     count6 = count6 +1;}

    if(digit1 == 7 || digit2 == 7 || digit3 == 7 || digit4 == 7 || digit5 == 7){

     count7 = count7 +1;}

    if(digit1 == 8 || digit2 == 8 || digit3 == 8 || digit4 == 8 || digit5 == 8){

     count8 = count8 +1;}

    if(digit1 == 9 || digit2 == 9 || digit3 == 9 || digit4 == 9 || digit5 == 9){

     count9 = count9 +1;}

   }

   System.out.println("\n0" + "(" + count0 + ")");

   for (int i = 0; i < count0; i++){



   System.out.print("*");}

   System.out.println("\n1" + "(" + count1 + ")");

   for (int i = 0; i < count1; i++){



   System.out.print("*");}

   System.out.println("\n2" + "(" + count2 + ")");

   for (int i = 0; i < count2; i++){



   System.out.print("*");}

   System.out.println("\n3" + "(" + count3 + ")");

   for (int i = 0; i < count3; i++){



   System.out.print("*");}

   System.out.println("\n4" + "(" + count4 + ")");

   for (int i = 0; i < count4; i++){



   System.out.print("*");}

   System.out.println("\n5" + "(" + count5 + ")");

   for (int i = 0; i < count5; i++){



   System.out.print("*");}

   System.out.println("\n6" + "(" + count6 + ")");

   for (int i = 0; i < count6; i++){



   System.out.print("*");}

   System.out.println("\n7" + "(" + count7 + ")");

   for (int i = 0; i < count7; i++){

 

   System.out.print("*");}

   System.out.println("\n8" + "(" + count8 + ")");

   for (int i = 0; i < count8; i++){



   System.out.print("*");}

   System.out.println("\n9" + "(" + count9 + ")");

   for (int i = 0; i < count9; i++){



   System.out.print("*");}

 }

}







  

Java Program Sentinel Control Loop

Java Program Sentinel Control Loop

Use in Program Eclipse

import java.util.Scanner;
public class SentinelControlLoop {

 /**
  * 
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  
  Scanner myInput = new Scanner(System.in);
  
  
  //Declare Variables
  int num, sum = 0, max, min, count =0;
  double average = 0.0;
  final int Sentinel = -9999;
  
  
  //Priming Stage
  System.out.print("Enter an integer value, or -9999 to quit: ");
  num = myInput.nextInt();
  
  //intitalize max and min
  max = min = num;
  
  
  
  //WHILE Loop
  while (num != Sentinel) {
   //body of loop
   //Update Sum
   sum = sum + num; //sum +=
   System.out.println("Sum is now "+ sum);
   
   if (num > max)
    max = num;
   if (num < min)
    min = num;
   
   //increment count of data items read
   count++; //Same as count = count + 1;
   System.out.print("num = " + num + " Count = " + count );
   System.out.print(" Enter an integer value, or -9999 to quit: ");
   num = myInput.nextInt();
   
   
  }
  if (count != 0) {
   average = (double)sum / count;
   System.out.println("Average is " + average);
   System.out.println (" max = "+ max + ", min " + min);
  }
  else 
   System.out.println("Cant average 0 items ");
  
 }

}

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