Print Mirror Lower Star Triangle Pattern using java

 Methods: We can print mirror lower star triangle pattern using loops, so 

  1. Using for loop
  2. Using while loop
  3. Using do-while loop

Method 1: Using for Loop

import java.io.*;


// Main class

class GFG {

// Method

// Main driver method

public static void main(String[] args)

{

// Declare and initialize variable to

// Size of the triangle

int number = 7;

// Declaring two variables for rows and columns

int m, n;

// Outer loop 1

// Prints the first half triangle

for (m = 1; m <= number; m++) {

// Inner loop 1

for (n = 1; n < m; n++) {

// Print whitespace

System.out.print(" ");

}

// Inner loop 2

for (n = m; n <= number; n++) {

// Print star

System.out.print("*"

+ " ");

}

// Ending line after each row

System.out.println();

}

// Outer loop 2

// prints the second half triangle

for (m = number - 1; m >= 0; m--) {

// Inner loop 1

for (n = 0; n < m; n++) {

// Print whitespace

System.out.print(" ");

}

// Inner loop 2

for (n = m; n <= number - 1; n++) {

// Print star

System.out.print("*"

+ " ");

}

// Ending line after each row

System.out.println();

}

}

}


Method 2: Using While Loop

// Java program to Print Mirror Lower Star Triangle Pattern

// using While loop

import java.io.*;


// Main Class

class GFG {


// Main driver method

public static void main(String[] args)

{

// Declare and initialize variable to

// Size of the triangle

int number = 7;


int m = number;

int n;


// Outer loop 1

// prints the first half triangle


// Till condition holds true

while (m > 0) {

n = 0;


// Inner loop 1

// prints space until n++ < number - m is false

while (n++ < number - m) {

// print whitespace

System.out.print(" ");

}


n = 0;


// Inner loop 2

// Prints star until n++ < (m * 2) - 1 is false

while (n++ < (m * 2) - 1) {

// Print star

System.out.print("*");

}


// Ending line after each row

System.out.println();


// Decrementing by one

m--;

}


m = 1;


// Outer loop 2

// prints the second half triangle

while (m <= number) {

n = 0;


// Inner loop 1

// prints space until n++ < number - m is false

while (n++ < number - m) {

// Print whitespace

System.out.print(" ");

}


n = 0;


// Inner loop 2

// Prints star until n++ < (m * 2) - 1 is false

while (n++ < (m * 2) - 1) {

// print star

System.out.print("*");

}


// Ending line after each row

System.out.println();


m++;

}

}

}


Method 3: Using do-while Loop
import java.io.*;

// Main class
class GFG {

// Main driver method
public static void main(String[] args)
{
// Declare variable with the
// Size of the triangle
int number = 7;

int m = number;
int n;

// Outer loop 1
// prints the first half triangle
do {
n = 0;

// Inner loop 1
// prints space until n++ < number - m is false
do {
// Print whitespaces
System.out.print(" ");

} while (n++ < number - m);

n = 0;

// Inner loop 2
// prints star until n++ < m * 2 - 2 is false
do {
// Print star
System.out.print("*");
}

while (n++ < m * 2 - 2);

System.out.println("");

}

// Condition check for do-while
while (--m > 0);

m = 1;

// Outer loop 2
// prints the second half triangle
do {
n = 0;

// Inner loop 1
// prints space until n++ < (number - m) is
// false
do {
// Print whitespace
System.out.print(" ");

} while (n++ < (number - m));

n = 0;

// Inner loop 2
// prints star until n++ < (m * 2) - 2 is false
do {
// Print star
System.out.print("*");
}

while (n++ < (m * 2) - 2);

System.out.println("");

}

// Condition check for do-while
while (++m <= number);
}
}


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