Print numbers in triangle format

Print numbers in triangle format

public class TriangleTest {

    public static void main(String[] arg){

        int a=1;

        for(int i=1;i<=4;i++){

            for(int space=i;space<4;space++){

            System.out.print(" ");   // for print spaces

            }

            for(int j=1;j<=i;j++){

                System.out.print(a+" ");//print number

                a++;

            }

            System.out.println();// for new line

        }

    }

/*

Output:

   1

  2 3

 4 5 6

7 8 9 10

*/

Print numbers in triangle format

Print numbers in right triangle format 

public class Triangle {

    public static void main(String[] arg){

        for(int i=1;i<=5;i++){  // loop for number of rows

            for(int j=1;j<=i;j++){

                System.out.print(j); // loop for print numbers

            }

            System.out.println();// new line

        }

    }    

} 

Output:

1

12

123

1234

12345

 Print numbers in left triangle format 

  public class Triangle {

     public static void main(String[] arg){

        for(int i=0;i<=6;i++){   // loop for number of rows     

            for(int space=i;space<6;space++){  // loop for spaces for each row

                System.out.print(" ");

            }                   

            for(int j=0;j<i;j++){   // loop for print stars (*)

                System.out.print("*");

            }

            System.out.println("");// new line

            }       

      }    

}  

Output:

     *

    **

   ***

  ****

 *****

******

Print numbers in triangle format 

public class Triangle {

       public static void main(String[] arg){

        for(int i=0;i<=6;i++)  // loop for number of rows

                                              {            

            for(int space=i;space<6;space++){ // loop for spaces for each row

                System.out.print(" ");

            }                   

            for(int j=0;j<i*2+1;j++){ 

            for(int j=0;j<i;j++){  // loop for print stars (*)

                System.out.print("*");

            }

            System.out.println("");// new line

            }          

        }    

}

Output:

      *

     ***

    *****

   *******

  *********

 ***********

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