Floyd’s Triangle
The Floyd’s Triangle is a right angled triangle with array of natural numbers. In this article we will show you, How to write a Java Program to print Floyd’s Triangle with example.
Java Program to print Floyd’s Triangle
This Java program allows the user to enter the maximum number of rows he/she want to print as Floyd’s triangle and then, this program will print the Floyd’s triangle of natural numbers until it reaches the user specified rows.
JAVA CODE
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// Java Program to print Floyd’s Triangle package ShapePrograms; import java.util.Scanner; public class FloydTriangle { private static Scanner sc; public static void main(String[] args) { int rows, i, j, number = 1; sc = new Scanner(System.in); System.out.println(" Please Enter the Number of Rows you wish to see in FloydTriangle: "); rows = sc.nextInt(); System.out.println("---- Printing FLOYD'S Triangle ------"); for ( i = 1 ; i <= rows; i++ ){ for ( j = 1 ; j <= i; j++ ) { System.out.format("%d ", number); number++; } System.out.println(""); } } } |
OUTPUT
ANALYSIS
Following statements will allow the User to enter the range or maximum Number of rows he/she want to print.
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System.out.println(" Please Enter the Number of Rows you wish to see in FloydTriangle: "); rows = sc.nextInt(); |
Now let us see the Nested for loop in Java
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for ( i = 1 ; i <= rows; i++ ){ for ( j = 1 ; j <= i; j++ ) { System.out.format("%d ", number); number++; } System.out.println(""); } |
Outer For Loop – First Iteration
From the above screenshot you can observe that, The value of i is 1 and Rows is 5 so, the condition (i <= 5) is True. So, it will enter into second for loop
Inner For Loop – First Iteration
The j value is 1 and the condition (j <= 1) is True. So, it will start executing the statements inside the loop. Following statement will print Number as Output and we all know that, Number = 1 so, 1 is printed
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System.out.format("%d ", number); |
Following statement will increment the Value of Number by 1 using the Increment Operator
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number++; |
Inner For Loop – Second Iteration
The j value will be 2 and the condition (2 <= 1) is False so it will exit from the second loop.
Following statement is used to terminate the current line
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System.out.println(""); |
Outer For Loop – Second Iteration
The value of i will be 2 and the condition (2 <= 5) is True. So, it will enter into second for loop
Inner For Loop – First Iteration
The value of j is 1 and the condition (1 <= 2) is True. So, it will start executing the statements inside the loop. Following statement will print Number as Output and we all know that, Number = 2 so, 2 is printed
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System.out.format("%d ", number); |
Following statement will increment the Value of Number by 1
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number++; |
Next, j value will also be incremented by 1.
Inner For Loop – Second Iteration
The value of j is 2 and the condition (2 <= 2) is True. So, it will start executing the statements inside the loop. It means, 3 will be printed.
Inner For Loop – Third Iteration
The j value will be 3 and the condition (3 <= 2) is False so it will exit from the second loop.
This will happen until it reaches to 5 and after that both the Inner Loop and Outer loop will be terminated.
Java Program to Print Floyd’s Triangle using Functions
This Java program allows the user to enter the maximum number of rows he/she want to print as Floyd’s triangle and then, this program will print the Floyd’s triangle of natural numbers using Functions
JAVA CODE
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package ShapePrograms; import java.util.Scanner; public class FloydTriangleusingMethods { private static Scanner sc; public static void main(String[] args) { int rows; sc = new Scanner(System.in); System.out.println(" Please Enter the Number of Rows you wish to see in FloydTriangle: "); rows = sc.nextInt(); System.out.println("---- Printing FLOYD'S Triangle ------"); FloydTriangle(rows); } public static void FloydTriangle (int rows) { int i, j, number = 1; for ( i = 1 ; i <= rows; i++ ) { for ( j = 1 ; j <= i; j++ ) { System.out.format("%d ", number); number++; } System.out.println(""); } } } |
OUTPUT
ANALYSIS
When the compiler reaches to FloydTriangle(rows); line then the compiler will immediately jump to below function:
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public static void FloydTriangle (int rows) { |
We already explained the LOGIC in above example.
NOTE: If we create a function with Void then there is no need to return any value but, if we declared a function with any data type (int, float etc) then we have to return something out from the function.
Java Program to Print Floyd’s Triangle without Natural numbers
This Java program allows the user to enter the number of rows he/she want to print as Floyd’s triangle. In this example we are going to print the Floyd’s triangle using the * symbol. This program can also be said as printing Right angled triangle with * symbol’s.
JAVA CODE
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// Floyd’s Triangle program in Java package ShapePrograms; import java.util.Scanner; public class FloydTrianglewithoutNumbers { private static Scanner sc; public static void main(String[] args) { int rows, i, j; sc = new Scanner(System.in); System.out.println(" Please Enter the Number of Rows you wish to see in FloydTriangle: "); rows = sc.nextInt(); System.out.println("---- Printing FLOYD'S Triangle ------"); for ( i = 1 ; i <= rows; i++ ) { for ( j = 1 ; j <= i; j++ ) { System.out.format("* "); } System.out.println(""); } } } |
OUTPUT
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