<ul>
<li>Uppercase: a uppercase is to to transfer small character to capital character in string
</li>
<li>Lowercase: a Lowercase is to to transfer capital character to small character in string.
</li>
</ul>
Example:
<pre><code class="lang-dart">// uppercase &amp;
// Lowecase program simple example
void main(){
 String str ="Hello Jeet";

 print(str.toUpperCase());

 print(str.toLowerCase());
}
</code></pre>
OUTPUT:
<pre><code class="lang-dart">HELLO JEET
hello jeet
</code></pre>

* Uppercase: a uppercase is to to transfer small character to capital character in string
    
* Lowercase: a Lowercase is to to transfer capital character to small character in string.
    

Example:

```dart
// uppercase &
// Lowecase program simple example
void main(){
  String str ="Hello Jeet";

  print(str.toUpperCase());

  print(str.toLowerCase());
}
```

OUTPUT:

```dart
HELLO JEET
hello jeet
```

Uppercase & Lowercase