RandomTest.jack

// Copyright (c) 2018, Bill Mei
// Test the Random number generator to make sure
// the numbers it generates are sufficiently random
class RandomTest {
   function void test() {
      var int a, b, c, d, e, f, i, result;
      do Screen.clearScreen();
      do Random.init();

      // Roll a dice 6000 times; each face should have a result of about 1000.
      let i = 0;
      while (i < 6000) {
         let result = Random.randInt(1, 7);
         if (result = 1) { let a = a + 1; }
         if (result = 2) { let b = b + 1; }
         if (result = 3) { let c = c + 1; }
         if (result = 4) { let d = d + 1; }
         if (result = 5) { let e = e + 1; }
         if (result = 6) { let f = f + 1; }
         let i = i + 1;
      }

      do Output.println();
      do Output.printString("Rolled a 1: "); do Output.printInt(a); do Output.println();
      do Output.printString("Rolled a 2: "); do Output.printInt(b); do Output.println();
      do Output.printString("Rolled a 3: "); do Output.printInt(c); do Output.println();
      do Output.printString("Rolled a 4: "); do Output.printInt(d); do Output.println();
      do Output.printString("Rolled a 5: "); do Output.printInt(e); do Output.println();
      do Output.printString("Rolled a 6: "); do Output.printInt(f); do Output.println();

      do Sys.wait(1000);
      do Screen.clearScreen();
      do Output.moveCursor(0, 0);

      // Fill the screen with pixels, the output
      // should look like random noise
      do Output.printString("Filling the screen with random points...");
      let i = 0;
      do Screen.setColor(true);
      while (i < 10000) {
         let a = Random.randInt(0, 512);
         let b = Random.randInt(0, 256);

         do Screen.drawPixel(a, b);

         let i = i + 1;
      }

      do Screen.clearScreen();
      do Output.moveCursor(0, 0);
      return;
   }
}