Write a program that draws a pyramid of blocks of any given height in Java. Exam

Question

Write a program that draws a pyramid of blocks of any given height in Java.

Example: like this for height 4:

[ ]

[ ] [ ]

[ ] [ ] [ ]

[ ] [ ] [ ] [ ]

Note that each block is a pair of square brackets.

-The program must use a recursive method to draw the pyramid.

-The recursive method should do two things: Make a recursive call, and print one line of the pyramid.

-Each line of the pyramid is a sequence of spaces followed by a sequence of blocks.

-Use two parameters for the recursive method: one that holds the number of spaces to print before the blocks, and one that holds the number of blocks to print.

Explanation / Answer

public class Pyramid
{
public static void main(String[] args)
{
java.util.Scanner scan = new java.util.Scanner(System.in);

System.out.println(“Enter the size : “);

int n = scn.nextInt();

for (int f=1;f<=n;f++) // for 5 loops
{
for (int sp=n-f;sp>=0;sp--) //for spaces
{
System.out.print(" ");
}
for (int s=f;s>=1;s--) // to display pyramid
{
System.out.print(“[]“+” ");
}
System.out.println(); // for line break
}
}
}

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