program Crazy 8 // Input: A list of up to 16 positive integers terminated by a 0000 // Output: The positive integers in reverse order // Remarks: The data is stored starting at memory location 00. // If you enter more than 16 integers, you will overwrite // the program itself. To see the crazy 8 virus, enter // 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (16 1's) // 8888 8810 98FF C011 // ----------------------------------------------------------------------------- 10: 7101 R[1] <- 0001 R[1] always 1 11: 7A00 R[A] <- 0000 memory address of array a[] 12: 7B00 R[B] <- 0000 # elements in array = n // Read in sequence of positive integers 13: 8CFF read R[C] while (1) { 14: CC19 if (R[C] == 0) goto 19 if ((read R[C]) == 0) break 15: 16AB R[6] <- R[A] + R[B] a + n 16: BC06 mem[R[6]] <- R[C] a[n] = c 17: 1BB1 R[B] <- R[B] + R[1] n++ 18: C013 goto 13 } // Print out results in reverse order 19: CB20 if (R[B] == 0) goto 20 while (n != 0) { 1A: 16AB R[6] <- R[A] + R[B] a + n 1B: 2661 R[6] <- R[6] - R[1] a + n - 1 1C: AC06 R[C] <- mem[R[6]] c = a[n-1] 1D: 9CFF write R[C] print c 1E: 2BB1 R[B] <- R[B] - R[1] n-- 1F: C019 goto 19 } 20: 0000 halt