Question

Write a JAVA program to display a “*” triangle and a half diamond of size n, where n is the input of the program. For example, when the user enters 4 as n’s value, the program should print the following shapes of “*”: A triangle of size 4:

*

***

*****

*******

A half diamond of size 4:

*

***

*****

*******

*****

***

*

Extra Credit (+5) Print the following pattern instead. A triangle of size 4, using *:

*

***

*****

*******

A diamond of size 4, using *:

*

***

*****

*******

*****

***

*

Answer 1

CODE

import java.util.Scanner;

public class Main

{

public static void printTriangle(int n)

{

int i, j;

// outer loop to handle number of rows

// n in this case

for(i=1; i<=n; i++)

{

// inner loop to handle number of columns

// values changing acc. to outer loop

for(j=1; j<=2*i-1; j++)

{

// printing stars

System.out.print("*");

}

// ending line after each row

System.out.println();

}

}

public static void printDiamond(int n)

{

int i, j;

// outer loop to handle number of rows

// n in this case

for(i=1; i<=n; i++)

{

// inner loop to handle number of columns

// values changing acc. to outer loop

for(j=1; j<=2*i-1; j++)

{

// printing stars

System.out.print("*");

}

// ending line after each row

System.out.println();

}

for(i=n-1; i >= 1; i--)

{

for (j=1; j<=2*i-1; j++) {

// printing stars

System.out.print("*");

}

// ending line after each row

System.out.println();

}

}

// Driver Function

public static void main(String args[])

{

Scanner sc = new Scanner(System.in);

int n;

System.out.println("Enter the number of rows: ");

n = sc.nextInt();

printTriangle(n);

System.out.println("\n");

printDiamond(n);

}

}

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