c-labs/lab-3/lab_3_description.md

# Lab 3 - Fancy shapes

In this lab we'll be focusing on the C programming aspect. This will cover
for-loops and if-statements. To practice these we'll be drawing some shapes in
the terminal!

The input will be one of the following numbers, passed through argv:
 1. A square
 2. A triangle
 3. An inverted triangle (upside down)
 4. A diamond

Your program will take in 2 arguments. The first is a number between 1 and 4,
indicating which of the shapes listed above you'll be printing. The second
argument is a number indicating the _largest horizontal width_ of the shape. For
example, for a triangle, this'll be the width of the base.

Your program will print the indicated shape at the indicated dimensions. Write
your code in a `main.c` file, then run `bash check.sh main.c` to test your code.

## Examples

#### Example 1

```
./a.out 1 4
```

Output:

```
$$$$
$$$$
$$$$
$$$$
```

#### Example 2

```
./a.out 1 10
```

Output:

```
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
$$$$$$$$$$
```

#### Example 3

```
./a.out 2 6
```

Output:

```
  $$
 $$$$
$$$$$$
```

Notice how with an even number for the width, will result with 2 at the top, not
one.

#### Example 4

```
./a.out 2 7
```

Output:

```
   $
  $$$
 $$$$$
$$$$$$$
```

#### Example 5

```
./a.out 3 14
```

Output:

```
$$$$$$$$$$$$$$
 $$$$$$$$$$$$
  $$$$$$$$$$
   $$$$$$$$
    $$$$$$
     $$$$
      $$
```

#### Example 6

```
./a.out 4 14
```

Output:

```
      $$
     $$$$
    $$$$$$
   $$$$$$$$
  $$$$$$$$$$
 $$$$$$$$$$$$
$$$$$$$$$$$$$$
 $$$$$$$$$$$$
  $$$$$$$$$$
   $$$$$$$$
    $$$$$$
     $$$$
      $$
```

#### Example 7

```
./a.out 4 15
```

Output:

```
       $
      $$$
     $$$$$
    $$$$$$$
   $$$$$$$$$
  $$$$$$$$$$$
 $$$$$$$$$$$$$
$$$$$$$$$$$$$$$
 $$$$$$$$$$$$$
  $$$$$$$$$$$
   $$$$$$$$$
    $$$$$$$
     $$$$$
      $$$
       $
```

## Testing

Run the following command to test your work:

```
bash check.sh main.c
```

If the output doesn't say you passed, your program has a bug. Fix it and then
try again.