/*
 *   Intro to Programming CSE 1310
 * University of Texas at Arlington
 */

package code14feb19;

import java.util.Scanner;

/**
 *
 * @author jcmtiernan
 */
public class Code14Feb19 
{

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
        // Loop within a loop to print a table
        
        int current = -1;
        int target = 50;
        int index = -1;
        int numTgt = 0;
        System.out.println("Generating random numbers to search.  Making table with 10 columns by % 10");
        for (int i = 0; i < 100; i++)  // (initialization; test; increment)
        {
            current = (int) (Math.random() * 100);
            //System.out.println(i+ ". "+current); 
            if ((i % 10) == 0)
                System.out.println("");            
            System.out.print(current+"\t");

            
            if (target == current)
            {
                index = i;
                numTgt++;
            }
        
        }
        System.out.println("");
        if (index > -1)
        {
            System.out.println("Found target of "+target+" at index "+index+" with count of "+numTgt);
        }
        else
        {
            System.out.println("Target "+target+"was not in data set");
        }   
        System.out.println("\n");
        // i = 4; i is not in the scope at this point
        System.out.println("\nPrinting table with nested for loops");

        int k;
        current = 0;
        for (k = 0; k < 5; k++)
        {
            for (int j = 0; j < 5; j++)
            {
                System.out.print(current + "\t");
                current += 2;
            }
            System.out.println("");
        }
        System.out.println("");
            
        int j = 0;
        current = 100;
        System.out.println("\nEmpty for loop header example");
        for (; j < 5; )  // notice that for loop can have empty initialization and increment sections
        {
            System.out.print(current + "\t");
            current -= 2;
            j++;
        }  
        
        System.out.println("\n");
        
        // Don't do this in Dr. T's class
        // Do not mix the loop control with the loop body elements in the for loop header
        System.out.println("\nUgly for loop header example");
        for (int m = 0, c = 300; m < 5; m++, c -= 2)
        {
            System.out.print(c + "\t");
            
        }        
        // Extra loop examples to print a table
        System.out.println("\n\nExtra loop examples to print a table\n");
        int value = 1;
        final int MAX = 6;
        int j2 = 0;
        // while loop inside a for loop
        System.out.println("\nPrinting 2nd matrix/table by using while loop inside a for loop");

        for (int k2 = 0; k2 < MAX; k2++)
        {
            j2 = 0;
            while (j2 < MAX)
            {
                System.out.print((value++)+"\t");
                j2++;
            }
            System.out.println("");
        }      
        System.out.println("\nPrinting 3rd matrix/table by using for loop inside a while loop");
        
        value = 0;
        j = 0;
        //for (int k = 0; k < MAX*2; k++)
        while (j < MAX*2)
        {
            for (int k3 = 0; k3 < j; k3++)
            {
                System.out.print((value)+"\t");
            }
            System.out.println("");
            value++;
            j++;            
        }        

        
        
        
        System.out.println("\nComparing current and previous values\n");
        
	// Compare current input to previous input 5 times and  
        int curr = -1;
        int prev = -1;
        Scanner input = new Scanner(System.in);        
        System.out.println("Please enter a positive integer less than 100: ");
        prev = input.nextInt();
        prev = errorCheckPos50(prev);
        /*
        while ((prev >= 50) || (prev < 0))
        {
            System.out.println("Your input was invalid.  Please enter another positive integer less than 50: ");
            prev = input.nextInt();                
        }
        */
        for (int n = 0; n < 5; n++)
        {
            System.out.println("Please enter another positive integer less than 100: ");
            curr = input.nextInt();
            curr = errorCheckPos50(curr);
            // loop to validate input (ex. valid range of values) 
            /*
            while ((curr >= 50) || (curr < 0))
            {
                System.out.println("Your input was invalid.  Please enter another positive integer less than 50: ");
                curr = input.nextInt();                
            }
            */
            if (curr > prev)
            {
                System.out.println("Your current input "+curr+" is larger than your last input of "+prev);
            }
            else if (curr < prev)
            {
                System.out.println("Your current input "+curr+" is smaller than your last input of "+prev);
            }   
            else
            {
                System.out.println("Your current input "+curr+" is equal to your last input of "+prev);
            }
            prev = curr;
        }
        
        
        
        
        
    }
    public static int errorCheckPos50(int value)
    {
        Scanner input = new Scanner(System.in);
        while ((value >= 100) || (value < 0))
        {
            System.out.println("Your input was invalid.  Please enter another positive integer less than 50: ");
            value = input.nextInt();                
        } 
        return value;    
            
    }

}