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Thread: Triangle Printing - Java Program

  1. #1
    Junior Member
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    Talking Triangle Printing - Java Program

    Hey all

    With this code you can print a Triangle

    Reg

    public class TrianglePrinting {
     
    	/*
    	 * Prints the numbers in the right angle manner.
    	 */
    	public static void TrianglePrinting(int n) {
    		int counter = 0, i = 1;
    		while (i <= n) {
    			counter++;
    			for (int j = 0; j < counter; j++) {
    				if (i > n)
    					break;
    				System.out.print(i + " ");
    				i++;
    			}
    			System.out.println();
    		}
    	}
     
    	public static void main(String[] args) {
    		TrianglePrinting(14);
    	}
     
    }

    Output:
    1
    2 3
    4 5 6
    7 8 9 10
    11 12 13 14


  2. #2
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    Default Re: Triangle Printing - Java Program

    I got other version of that program that asks the user the high of the triangle, and the symbol that he/she wants to use to print the triangle, I also wrote a simple menu
    just to show;

    public class Triangle {
     
    	public static void main(String[] args) {
     
    		Scanner input = new Scanner (System.in);
    		int optiona =0;
     
    		do{	
    			optiona = optiona();
     
    			switch (opcao){
    			case 0:	
                                   System.exit()
                            break;
     
                            case 1:
    			       System.out.println("Insert the tringle's high :");
    			       int high = input.nextInt();	
     
    			       System.out.println();
    			       System.out.println("Insert the triangle's symbol :");
    			       char symbol = input.next().charAt(0);
     
    			       for (int l=1; l <= altura; l++ ){
     
    				       printSequence(high-l,' ');	
    				       printSequence(2*l-1,symbol);
    				       System.out.println();
    		               }
                            break;
    		}while(opcaoa != 0);
    	}
     
    	/**
    	 * Prints in the screen a sequence with n copys of c 
    	 * @param n size of the sequence
    	 * @param c character of the sequence
    	 */
    	public static void printSequence(int n, char c) {
    		for (int i=1; i <= n; i++ )
    			System.out.print(c);
    	}
     
    	public static int optiona(){ //Prints the menu until the option is valid
     
    		int optiona =0;
    		do{ 
    			Scanner input = new Scanner (System.in);
    			System.out.println("Choose an option:");
    			System.out.println("		0 - Exit");
    			System.out.println("		1 - Create triangle");
    			opcaoa = input.nextInt();
     
    			if (optiona <0 || optiona >1) // verify if the option is valid
    				System.out.println("Invalid option!, please choose another option");
    		}while(optiona <0 || optiona>1);
    	return optiona;
    	}
    }


    Sorry if something wrong, and hope some comments (new in forum, and still getting used to it)

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