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Triangle_Pattern.java

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/****************************************************************

* Triangle_Pattern.java

* Author: Himanshu Sharma

* Contact: himanshusharma2972@gmail.com

* Discription : This is Practice for creating Pattern on screen for learning purpose.

*

*

/******************************************************************/

import java.util.Scanner;

class triangle

{ int a,b;

public void rep(int i,int n)

{

for(a=i;a<=2*n-i;a++)

{

System.out.print(" ");

}

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

{

System.out.print("*");

}

}

public static void main(String args[])

{ triangle obj=new triangle();

Scanner sc=new Scanner(System.in);

int i,j,k,n,a,b,c;

n=3;

int t; //this variable is used to define no of triangle

System.out.println("Enter no of triangle:");

t=sc.nextInt();

int temp;

temp=t;

//this is used to count the up and downn triangle

int u=0,d=0;

while(t>=1)

{

if(t%2==0)

{

d=d+1;

}

else

{

u=u+1;

}

t--;

}

t=temp;//re initialize due to loop

/* printing up triangle*/

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

{ System.out.println();

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

{System.out.print(" ");

}

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

{

System.out.print("*");

}

for(c=1;c<u;c++)

{

obj.rep(i,n);

}

}

/*printing down triangle*/

int x;

if(d>0)

{

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

{ System.out.println();

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

{System.out.print(" ");

}

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

{

System.out.print("*");

}

for(c=1;c<d;c++)

{

obj.rep(i,n);

}

}

}

System.out.println();

}

}