Programming In Java | Week 8

Programming In Java | Week 8

Course Link: https://onlinecourses.nptel.ac.in/noc23_cs74/course

Programming Assignment

1. Write a program which will print a pyramid of “*” ‘s of height “n” and print the number of “*” ‘s in the pyramid.

Solution:

import java.util.*;
public class Pattern1 {
    public static void main(String[] args) {
        Scanner inr = new Scanner(System.in);
	    int n = inr.nextInt();
        int k = 0,sum=0;
        for(int i = 1; i <= n; ++i, k = 0)
        {
            for(int space = 1; space <= n - i; ++space)
            {
                System.out.print("  ");
            }
            while(k != 2 * i - 1)
            {
                System.out.print("* ");
                sum=sum+1;
                ++k;
            }
            System.out.println();
        }
        System.out.print(sum);
    }
}

2. Write a program which will print a pascal pyramid of “*” ‘s of height “l” .

Solution:

import java.util.*;
public class Pattern2 {
    public static void main(String[] args) {
        Scanner inr = new Scanner(System.in);
	    int l = inr.nextInt();
        int i,j;
        int space=l-1;
        for(i=0;i< l;i++)
        {
            for(j=0;j< space;j++)
            {
                System.out.print(" ");
            }
            for(j=0;j<=i;j++)
            {
                System.out.print("* ");
            }
            System.out.print("\n");
            space--;
         }
     }
}

3. Write a program which will print a pyramid of “numbers” ‘s of height “n” and print the sum of all number’s in the pyramid.

Solution:

import java.util.*;
public class Pattern3 {
    public static void main(String[] args) {
        Scanner inr = new Scanner(System.in);
	    int n = inr.nextInt();
        int k = 1,sum=0;
        for(int i = 1; i <= n; ++i, k = 1)
        {
            for(int space = 1; space <= n-i; ++space)
            {
                System.out.print("  ");
            }
            while(k <= 2 * i - 1)
            {
                System.out.print(k+" ");
                sum=sum+k;
                ++k;
            }
            System.out.println();
        }
        System.out.print(sum);
    }
}

4. Write a program to print symmetric Pascal’s triangle of “*” ‘s of height “l” of odd length . If input “l” is even then your program will print “Invalid line number”.

import java.util.*;
public class Pattern4 {
    public static void main(String[] args) {
        Scanner inr = new Scanner(System.in);
	  	int l = inr.nextInt();
        int ul=0; // Upper Line
        int ll=0; // Lower Line

        if (l%2!=0)
        {
           ul=(l/2)+1;
           ll=l-ul;
           for(int i=1;i<=ul; i++)
           {
          		for(int s=1;s<=(ul-i); s++)
                {
              		System.out.print(" ");
          		}
          		for(int j=1;j<=i; j++)
                {
               		System.out.print("* ");
          		}
          		System.out.println();
          }

          int llc=ll;
          for(int i=1;i<=ll; i++)
          {
          		for(int s=llc;s<ll; s++)
                {
             		System.out.print(" ");
          		}
          		for(int j=1;j-1<=ll-i; j++)
                {
             		System.out.print(" *");
           		}
           		llc--;
          		System.out.println();
          }
       }
       else
       {
       		System.out.print("Invalid line number");
       }
    }
}

5. Write a program to display any digit(n) from 0-9 represented as a “7 segment display”.

Solution:

import java.util.*;
public class Pattern5{
   private static final Map<Integer,Integer> encodings=new HashMap<Integer,Integer>();

    static{
        encodings.put(0, 0x7E);
        encodings.put(1, 0x30);
        encodings.put(2, 0x6D);
        encodings.put(3, 0x79);
        encodings.put(4, 0x33);
        encodings.put(5, 0x5B);
        encodings.put(6, 0x5F);
        encodings.put(7, 0x70);
        encodings.put(8, 0x7F);
        encodings.put(9, 0x7B);
    }

    public static void printDigit(int digit)
    {
        int code = encodeDigit(digit);
        char[] bits = String.format("%7s",Integer.toBinaryString(code))
          .replace(' ','0').toCharArray();

        lightSegmentDisp(bits[0] == '1', " _ \n", "   \n");
        lightSegmentDisp(bits[5] == '1', "|", " ");
        lightSegmentDisp(bits[6] == '1', "_", " ");
        lightSegmentDisp(bits[1] == '1', "|\n", " \n");
        lightSegmentDisp(bits[4] == '1', "|", " ");
        lightSegmentDisp(bits[3] == '1', "_", " ");
        lightSegmentDisp(bits[2] == '1', "|\n", " \n");
    }

    private static void lightSegmentDisp(boolean On, String onVal, String offVal)
    {
        System.out.print(On ? onVal : offVal);
        try {
            Thread.sleep(0);
        }
        catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    private static int encodeDigit(int d) {
        return encodings.containsKey(d) ? encodings.get(d) : 0x00;
    }
   public static void main(String[] args) throws Exception {
           Scanner inr = new Scanner(System.in);
	   	   int n = inr.nextInt();
           printDigit(n);
    }
}