# COMP-200: Intro to Computer Systems
## Assignment 4
### mo khan - 3431709

Choose ONE exercise each from Chapters 10, 11, and 12.
There are no chapter end exercises for Chapter 9.

Chapter 10:

> 9. In Python, indentation is used to indicate the extent of a block of code. What is the output of the following Python code?

```python
!include assignments/4/main.py
```

```bash
$ python assignments/4/main.py
second is bigger
first is bigger
```

Chapter 11:

1. Identify the tokens in each of the following statements. (You do not need to classify them; just identify them.)
    a. `if (a == b1) a = x + y;`

      | token | type                 |
      | ----- | ----                 |
      | if    | if condition         |
      | (     | left paren           |
      | a     | symbol               |
      | ==    | comparison operator  |
      | b1    | symbol               |
      | a     | symbol               |
      | =     | assignment operator  |
      | x     | symbol               |
      | +     | addition operator    |
      | y     | symbol               |
      | ;     | statement terminator |

    b. `delta = epsilon + 1.23 - sqrt(zz);`

      | token   | type                  |
      | -----   | ----                  |
      | delta   | symbol                |
      | =       | assignment operator   |
      | epsilon | symbol                |
      | +       | addition operator     |
      | 1.23    | floating point number |
      | -       | subtraction operator  |
      | sqrt    | symbol                |
      | (       | left paren            |
      | zz      | symbol                |
      | )       | right paren           |
      | ;       | statement terminator  |

    c. `print(Q);`

      | token | type                 |
      | ----- | ----                 |
      | print | symbol               |
      | (     | left paren           |
      | Q     | symbol               |
      | )     | right paren          |
      | ;     | statement terminator |

Chapter 12:

> 5. Given the Turing machine instruction `(1,1,0,2,L)` and the configuration `...b 1 0 b...` draw the next configuration.

* `(1,1,0,2,L)` - Move left once and halt the machine

```plaintext
--------|*|----------
|.|.|.|b|1|0|b|.|.|.|
--------|*|----------
         ^
         |- 1
```

```plaintext
------|*|------------
|.|.|.|b|0|0|b|.|.|.|
------|*|------------
       ^
       |- 2
```