Manuals/calci/Examples

Examples of Java and z3 Programs

DESCRIPTION

• Synchronous Readline for interactively running to have a conversation with the user via a console.
  
• Original codes in java as examples.
  
• z3 codes with z3 notations are shown below the java code.
  
  

Examples

ExampleS1: Check if number is Odd/Even

• Program to check if the number is Odd/Even.
• z3 notations for if-else loop is used.
  

Java Code:
https://beginnersbook.com/2014/02/java-program-to-check-even-or-odd-number

import java.util.Scanner;
class CheckEvenOdd
{
  public static void main(String args[])
  {
    int num;
    System.out.println("Enter an Integer number:");
    //The input provided by user is stored in num
    Scanner input = new Scanner(System.in);
    num = input.nextInt();
    // If number is divisible by 2 then it's an even number
    // else odd number*/
    if ( num % 2 == 0 )
        System.out.println("Entered number is even");
    else
        System.out.println("Entered number is odd");
  }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");   
    var temp;
    var num = readlineSync.question("Enter any number: ");
    ( num % 2 == 0 )::
        {console.log(num + " is an even number")},
        {console.log(num + " is an odd number")};

ExampleS2: Sum of a given Array

• Program to calculate the sum of a given array.
• z3 function for SUM is used.

Java Code:
https://beginnersbook.com/2014/01/java-program-to-sum-the-elements-of-an-array

import java.util.Scanner;
class SumDemo{
   public static void main(String args[]){
      Scanner scanner = new Scanner(System.in);
      int[] array = new int[10];
      int sum = 0;
      System.out.println("Enter the elements:");
      for (int i=0; i<10; i++)
      {
    	  array[i] = scanner.nextInt();
      }
      for( int num : array) {
          sum = sum+num;
      }
      System.out.println("Sum of array elements is:"+sum);
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");   
      var k;
      k = readlineSync.question("Number of elements: ");
      var numbers = new Array(k);
      //Enter numbers using comma
      var num = readlineSync.question("Enter the elements: ");
      var temp = num.split(",");
      for (var i=0; i<k; i++)
      {
    	 numbers[i] = temp[i];
      }
      var sumofarray = SUM(numbers);
      console.log("Sum:" +sumofarray);

ExampleS3: Linear Search

• Program to search the location of a given number in an array.
• z3 notations for if-else used.

Java Code:
https://beginnersbook.com/2014/04/java-program-for-linear-search-example

import java.util.Scanner;
class LinearSearchExample
{
   public static void main(String args[])
   {
      int counter, num, item, array[];
      //To capture user input
      Scanner input = new Scanner(System.in);
      System.out.println("Enter number of elements:");
      num = input.nextInt(); 
      //Creating array to store the all the numbers
      array = new int[num]; 
      System.out.println("Enter " + num + " integers");
      //Loop to store each numbers in array
      for (counter = 0; counter < num; counter++)
        array[counter] = input.nextInt();

      System.out.println("Enter the search value:");
      item = input.nextInt();

      for (counter = 0; counter < num; counter++)
      {
         if (array[counter] == item) 
         {
           System.out.println(item+" is present at location "+(counter+1));
           /*Item is found so to stop the search and to come out of the 
            * loop use break statement.*/
           break;
         }
      }
      if (counter == num)
        System.out.println(item + " doesn't exist in array.");
      }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");   
    var k;
    k = readlineSync.question("Number of elements: ");
    var numbers = new Array(k);
    //Enter numbers using comma
    var num = readlineSync.question("Enter the elements: ");
    var temp = num.split(",");
    var item = readlineSync.question("Enter the search value: ");
	  
    for (i = 0; i < k; i++)
    {
        (temp[i]-item== 0):: 
        {
           console.log(item+" is present at location "+(i+1));
           break;
        };
    }
    (i-k ==0)::
    {console.log(item + " doesn't exist in array.")};

ExampleS4: Floyd's Triangle

• Printing the Floyd's triangle for a given number of rows.
• z3 function FLOYDSTRIANGLE is used.

Java Code:
https://beginnersbook.com/2014/04/java-program-to-print-floyds-triangle-example

import java.util.Scanner;
class FloydTriangleExample
{
    public static void main(String args[])
    {
       int rows, number = 1, counter, j;
       //To get the user's input
       Scanner input = new Scanner(System.in);
       System.out.println("Enter the number of rows for floyd's triangle:");
       //Copying user input into an integer variable named rows
       rows = input.nextInt();
       System.out.println("Floyd's triangle");
       System.out.println("****************");
       for ( counter = 1 ; counter <= rows ; counter++ )
       {
           for ( j = 1 ; j <= counter ; j++ )
           {
                System.out.print(number+" ");
                //Incrementing the number value
                number++;
           }
           //For new line
           System.out.println();
       }
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");
    var rows;
    var	tri;
	
    rows = readlineSync.question("Enter the number of rows for floyd's triangle: ");
    console.log("Floyd's triangle");
    console.log("****************");
    tri = FLOYDSTRIANGLE(rows)
    console.log(tri);

ExampleS5: Reverse Number

• Program to find the reverse of a number.
• For floats you do not do a comparison with zero. It should be absolute value to be less than a small number.
• z3 functions FLOOR and SIGN are used.

Java Code:
https://beginnersbook.com/2014/01/java-program-to-reverse-a-number

import java.util.Scanner;
class ReverseNumberWhile
{
   public static void main(String args[])
   {
      int num=0;
      int reversenum =0;
      System.out.println("Input your number and press enter: ");
      //This statement will capture the user input
      Scanner in = new Scanner(System.in);
      //Captured input would be stored in number num
      num = in.nextInt();
      //While Loop: Logic to find out the reverse number
      while( num != 0 )
      {
          reversenum = reversenum * 10;
          reversenum = reversenum + num%10;
          num = num/10;
      }

      System.out.println("Reverse of input number is: "+reversenum);
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");
     var num = 0;
     var reversenum = 0;
     var num = readlineSync.question("Input your number and press enter: ");
     var temp = num;
     while( abs(num) > 0.00001 )
     {
         reversenum = reversenum * 10;
         reversenum = reversenum + abs(num%10);
         num = FLOOR(abs(num/10));
     }
     console.log(SIGN(temp)*reversenum);

ExampleS6: Calculate the Factorial of a number

• Program to calculate the factorial of a user input number.
• In the code num is multiplied by 1, to convert it from a string to number.
• z3 funtion FACTORIAL is uded.

Java Code:
https://beginnersbook.com/2014/01/java-program-to-find-factorial-of-a-given-number-using-recursion

import java.util.Scanner;
class FactorialDemo{
   public static void main(String args[]){
      //Scanner object for capturing the user input
      Scanner scanner = new Scanner(System.in);
      System.out.println("Enter the number:");
      //Stored the entered value in variable
      int num = scanner.nextInt();
      //Called the user defined function fact
      int factorial = fact(num);
      System.out.println("Factorial of entered number is: "+factorial);
   }
   static int fact(int n)
   {
       int output;
       if(n==1){
         return 1;
       }
       //Recursion: Function calling itself!!
       output = fact(n-1)* n;
       return output;
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");   
      var num;
      var fact;
      num = readlineSync.question("Enter the number: ");
      console.log(typeof num)
      fact = FACTORIAL(num*1);
      console.log(num,fact);

ExampleS7: Area of Rectangle

• Program to find the area of rectangle.

Java Code:
https://beginnersbook.com/2014/01/java-program-to-calculate-area-of-rectangle

import java.util.Scanner;
class AreaOfRectangle {
   public static void main (String[] args)
   {
	   Scanner scanner = new Scanner(System.in);
	   System.out.println("Enter the length of Rectangle:");
	   double length = scanner.nextDouble();
	   System.out.println("Enter the width of Rectangle:");
	   double width = scanner.nextDouble();
	   //Area = length*width;
	   double area = length*width;
	   System.out.println("Area of Rectangle is:"+area);
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting"); 
	var length;
	var width;
        var area;
        length = readlineSync.question("Enter the length of Rectangle:");
	width = readlineSync.question("Enter the width of Rectangle:");
	//Area = length*width;
	area = length*width;
	console.log("Area of Rectangle is:"+area);

ExampleS8: Display Prime Numbers

• Program to print all the prime numbers till n.
• z3 function PRIMES is used.

Java Code:
https://beginnersbook.com/2014/01/java-program-to-display-prime-numbers

import java.util.Scanner;
class PrimeNumbers2
{
   public static void main (String[] args)
   {		
      Scanner scanner = new Scanner(System.in);
      int i =0;
      int num =0;
      //Empty String
      String  primeNumbers = "";
      System.out.println("Enter the value of n:");
      int n = scanner.nextInt();
      scanner.close();
      for (i = 1; i <= n; i++)  	   
      { 		 		  
         int counter=0; 		  
         for(num =i; num>=1; num--)
         {
	    if(i%num==0)
	    {
		counter = counter + 1;
	    }
	 }
	 if (counter ==2)
	 {
	    //Appended the Prime number to the String
	    primeNumbers = primeNumbers + i + " ";
	 }	
      }	
      System.out.println("Prime numbers from 1 to n are :");
      System.out.println(primeNumbers);
   }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting"); 
    var n;
    var primenumber;
    n = readlineSync.question("Enter the value of n: ");
    primenumbers = PRIMES(n,1); 
    console.log("Prime numbers from 1 to n are : "+ primenumbers);

ExampleS9: Ascending Order

• Program to find ascending order of the input numbers.
• z3 function ASCENDING is used.

Java Code:
https://beginnersbook.com/2014/07/java-program-for-bubble-sort-in-ascending-descending-order

import java.util.Scanner;

class BubbleSortExample {
  public static void main(String []args) {
    int num, i, j, temp;
    Scanner input = new Scanner(System.in);
 
    System.out.println("Enter the number of integers to sort:");
    num = input.nextInt();
 
    int array[] = new int[num];
 
    System.out.println("Enter " + num + " integers: ");
 
    for (i = 0; i < num; i++) 
      array[i] = input.nextInt();
 
    for (i = 0; i < ( num - 1 ); i++) {
      for (j = 0; j < num - i - 1; j++) {
        if (array[j] > array[j+1]) 
        {
           temp = array[j];
           array[j] = array[j+1];
           array[j+1] = temp;
        }
      }
    }
 
    System.out.println("Sorted list of integers:");
 
    for (i = 0; i < num; i++) 
      System.out.println(array[i]);
  }
}

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting"); 
    var num;
    var k; 
    var temp1;
    num = readlineSync.question("Enter the number of integers to sort: ");
    var array = new Array(num);
    k = readlineSync.question("Enter " + num + " integers: ");
    temp1 = k.split(",");
    var increase = ASCENDING(temp1);
    console.log("Sorted list of integers: " +increase);

ExampleS10: Inputting Matrix and Calculating it's Inverse

• Program to input mxn matrix.
• Finding Inverse of the matrix using z3 function MATRIXINVERSE.
• we have used regexp to handle both space tab and ,
• [\,\s] means any set of characters including , and space characters.
• + means more than one space assumed as 1. And regexp should be within / and /.
• .$(NUM) is used to convert all numbers in array which are strings to numbers.
  

Java Code:
http://www.sanfoundry.com/java-program-find-inverse-matrix

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");
var numbers = new Array();
var i=0;
do
{
        rowstring = readlineSync.question("Enter elements of matrix for row " + i + " (comma separated): ");
        if(rowstring=="")
        {
                break;
        }
        else
        {
           rowstring.split(/[\,\s]+/);
           numbers.push(rowstring.split(/[\,\s]+/));
           i++
        }
}while(true)
var inverse = MATRIXINVERSE(numbers.$(NUM));
console.log(inverse);

ExampleS11: Inputting 2 Matrices and Calculating Sum,Difference and Product

• Program to input 'k', mxn matrices.
• Note: Enter only 2 matrices for calculation purposes.
• Finding Sum,Difference and Product using z3 functions.
• Functions are MATRIXADD,MATRIXSUBTRACT, MATRIXMULTIPLY respectively.

Java Code:
http://www.sanfoundry.com/java-program-perform-matrix-multiplication

z3 code:

var readlineSync = require('readline-sync');
console.log("Starting");

var rows;
var columns;
var array1;
var temp1;
var temp;
var m = 0;
var numbers2 = new Array();
do
{
        rowstring = readlineSync.question("Enter matrix: ");
	if(rowstring=="")
	{
	break;
	}
	else
	{
             var k = 0;
	     var numbers = new Array(rows);
	     rows = readlineSync.question("Enter number of rows of matrix: ");
	     columns = readlineSync.question("Enter number of columns of matrix: ")
		
	     //Enter all elements row-wise with comma(like 1,2,3)
	     array1 = readlineSync.question("Enter the elements of matrix: ");
	     temp1 = array1.split(/[\,\s]+/);
	     temp = temp1.$(NUM);
		 
	     for (var i=0; i<rows; i++){
		var numbers1 = new Array(columns);
		for (var j = 0; j<columns; j++){
		    numbers1[j] = temp[k];
		    k++;
		}
	          numbers[i] = numbers1;
	     }
	     numbers2.push(numbers.$(NUM));
	     m++;
	 }
}while(true)

for (var i = 0;i<1;i++){
      //Compute for multiply,add,divide for any 2 given matrices
      var Result = MATRIXADD(numbers2[i],numbers2[i+1])
}
console.log(numbers2,Result);