Print a Floyd’s triangle having n rows.

-
import java.util.Scanner;
class triangle
{
public static void main(String arg[])
{
Scanner input=new Scanner(System.in);
System.out.println("Enter number of rows: ");
int num;
int ab=0;

num=input.nextInt();
               System.out.println();
               System.out.println();
for(int i=1;i<=num;i++)
{
for(int j=1;j<=i;j++)
{
if(ab==0)
{
ab=1;
System.out.print(ab);
}
else
{
ab=0;
System.out.print(ab);
}
}
System.out.println();
}
         }
}

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