A program to generate and display the first 5 lines of a Floyd triangle. (use n=5 and n=11 rows)?

Answers

• Chrisir

  April 2017

  make a for loop around your current for loop

  the outer for loop tells you in which line number you are.

  in the 1st line number, the inner for loop wants to go to 1,

  in the 2nd line number, the inner for loop wants to go to 2,

  etc.

  so the inner for loop takes the current number from the outer for loop as upper bound / max

  have a separate counter for the numbers you are printing
• Chrisir

  April 2017 edited April 2017

  it's called a nested for loop

      for ... {
          for ... {
          }
      }
  

  after the inner for loop, make a line break, e.g. by saying y+=19;

  when you use y in your text statement
• Sandyjakes

  April 2017

  So put:

  void setup() {
   
    size(800, 600);
    background(0);
   
  for(int j = 1; j <= 5; j ++) {
    for(int i = 1; i <= 1; i ++) {
      text(i, i * 10 + 100, 100);
   
    }
  }
  }
  
• Sandyjakes

  April 2017

  How's this:

  int i, j, k;
  
  void setup() {
  
    size(800, 600);
    k = 1;
  loop1: 
  
    for (i = 1; i <= 15; i ++) {
      for ( j= 1; j <= i; j ++) {
        if (k > 15) {
          continue loop1;
        }
        System.out.print(" "+k);
        k ++;
      }
      System.out.println("\n");
    }
  }
  
• Chrisir

  April 2017

  not bad!

  But that's not good.... :

    if (k > 15) {
      continue loop1;
    }
  

  this is sending the sketch in an endless loop between line 7 and 12 as soon as k>15 (and it's starting for loops again and again without ever ending them)

  instead design the for loops so that they just stop and have the right lower and upper bounds (where they start and end at)

  this is your starting point:

  the outer for loop tells you in which line number you are. So the outer for loop is just from line zero to how many lines you want!

  start from here:

  int i, j, k;
  
  void setup() {
  
    size(800, 600);
    k = 1;
  
  
    for (i = 0; i < 15; i++) {
      for (j = 0; j < i; j++) {
        System.out.print(" "+k);
        k++;
      }
      System.out.println("\n");
    }
  }
  
• Chrisir

  April 2017

  for usage of text():

      int numberToDisplay;
  
      void setup() {
  
        size(800, 600);
        numberToDisplay = 1;
  
        textAlign(CENTER);
  
        int x = 19; 
        int y = 19; 
  
        for (int i = 0; i < 15; i++) {
          for (int j = 0; j < i; j++) {
  
            text(numberToDisplay, x, y);
            numberToDisplay++;
  
            //next column
            x+=22;
          }//for
          // next line 
          x  =  19;
          y  += 24;
        }//for
      }//function 
  
• Sandyjakes

  April 2017

  How about this short way:

  int rows = 5;  
  int k = 1;
  int j; 
  int i;
  
  void setup() {
  
    size(800, 600);
  
    System.out.println("Floyd's triangle:");
  
    for (j = 1; j <= rows; j ++) {
      for (i = 1; i <= j; i ++) {
        print(k + " ");
        k ++;
      }
      println();
    }
  }
  
• Chrisir

  April 2017 Answer ✓

  Nice!

  Congratulations!!