Question

Write a Java program which implements both the while and for loop, as needed, to draw the illustrations given below.

Shape 1

123456789

12345678

1234567

123456

12345

1234

123

12

1

Shape 2

*************
*************
*************
*************
*************

Shape 3

============

* *

* *

* *

* *

* *

============

Hint:
To draw the shapes above, you can use nested for loops to accomplish the task. The outer for loop iterates on each row, and the inner for loop iterates on each column of current row.

Shape 1 has 9 rows and column is decreasing on each row.

          for (int row=0; row <rowSize; row++)  //iterate for each row
          {

for (int col=1; col<=rowSize-row; col++) //for each column on current row

{

              //display col number with a space
            }

            // display a new line
          }

       Shape 2 has 5 rows, 13 columns.

          for (int row=0; row <rowSize; row++)  //iterate for each row
         {

for (int col=0; col<colSize; col++) //for each column on current row

{

//display *

}

            // display a new line
         }

Answer 1

class Shapes
{
public static void main(String[] args)
{
System.out.println("Shape 1 Task");
int rowSize=9,row,col;
for(row=0;row<rowSize;row++)
{
for(col=1;col<=rowSize-row;col++)
{
System.out.print(col);
}
System.out.println();
}
System.out.println("Shape 2 Task");
int colSize=13;
rowSize=5;
for (row=0; row <rowSize; row++) //iterate for each row
{
for (col=0; col<colSize; col++) //for each column on current row
{
System.out.print("*");
}
System.out.println();
}
System.out.println("Shape 3 Task");
rowSize=7;
colSize=12;
for (row=0; row <rowSize; row++) //iterate for each row
{
for (col=0; col<colSize; col++) //for each column on current row
{
if(row==0 || row==6)
System.out.print("=");
else if(col==0 || col==10)
System.out.print("*");
else
System.out.print(" ");
}
System.out.println();
}
}
}

Output

koushikhp@koushikhpnew: koushikhp@koushikhpnew: javac Shapes.java koushikhp@koushikhpnew:-$ Java Shapes Shape 1 Task 123456789 12345678 1234567 123456 12345 1234 123 12 Shape 2 Task Shape 3 Task koushikhp@koushikhpnew:-$L