Write an application that displays the following patterns separately, one below

Question

Write an application that displays the following patterns separately, one below the other. Use for loops to generate the patterns. All asterisks (*) should be printed by a single statement of the form System.out.print( ‘*’ ); which causes the asterisks to print side by side. A statement of the form System.out.println(); can be used to move to the next line. A statement of the form System.out.print( ‘ ’ ); can be used to display a space for the last two patterns. There should be no other output statements in the program. [Hint: The last two patterns require that each line begin with an appropriate number of blank spaces.]


a) b)

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

c)


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

d)


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

Explanation / Answer

public static void main(String[] args) {
    /** a)
        * Line index 1-10
        * Number of asterisks per line equals to line index
        */
    for (int line = 1; line <= 10; line++) { //line 1-10
        for (int asterisk = 0; asterisk < line; asterisk++) {
            System.out.print('*');
        }
        System.out.println();
    }

    //Line spacing between a) and b)
    System.out.println();

    /** b)
        * Line index 10-1
        * Number of asterisks per line equals to line index
        */
    for (int line = 10; line >= 1; line--) { //line 10-1
        for (int asterisk = 0; asterisk < line; asterisk++) {
            System.out.print('*');
        }
        System.out.println();
    }

    //Line spacing between b) and c)
    System.out.println();

    /** c)
        * Line index 10-1
        * Number of spaces per line equals to (10 - line index)
        * Number of asterisks per line equals to line index
        */
    for (int line = 10; line >= 1; line--) { //line 10-1
        for (int space = 0; space < 10 - line; space++) {
            System.out.print(' ');
        }
        for (int asterisk = 0; asterisk < line; asterisk++) {
            System.out.print('*');
        }
        System.out.println();
    }

    //Line spacing between c) and d)
    System.out.println();

    /** d)
        * Line index 1-10
        * Number of spaces per line equals to (10 - line index)
        * Number of asterisks per line equals to line index
        */
    for (int line = 1; line <= 10; line++) { //line 10-1
        for (int space = 0; space < 10 - line; space++) {
            System.out.print(' ');
        }
        for (int asterisk = 0; asterisk < line; asterisk++) {
            System.out.print('*');
        }
        System.out.println();
    }
}

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