stacks.java

public  class Main
{
    public static void inverted_rotated_halfPyramid(int n ){
        int a= n-1;
        
        for(int i =1;i<=n;i++){
            
            for(int j =1;j<=a;j++)
              System.out.print(" ");
              
              
              for(int k=1;k<=i;k++)
              System.out.print("*");
              
              
              a--;
              System.out.println();
              
        }
        
    }
    public static void hollow_rectangle(int n ){
        //  no of lines 
        for(int i =1 ;i<=n;i++){
            // iternation for each line 
            for(int j = 1;j<=n;j++){
                
                if(i==1||j==1||i==n||j==n)
                System.out.print("*");
                
                else 
                System.out.print(" ");
                
                
            }
            System.out.print("\n");
            
        }
        
        
    }
	public static void main(String[] args) {
	   int n = 10;
	    inverted_rotated_halfPyramid(10);
	    
	    
	    
	    
	    
	    

 
	}
}