<h1 id="heading-important-notes-in-c">Important Notes in C:</h1>
<h2 id="heading-scanf-returned-value">scanf() Returned Value</h2>
<p><code>scanf() will return 0</code><br />If the input the user written doesn't match the format specifier<br /><code>%i or %d or %c</code> or whatever<br />like ( <strong>int</strong> was expected but it was <strong>char</strong> instead)<br /><strong>In this example</strong>:<br /> <code>("enter number %i and character %c", %num, %char);</code>  </p>
<ol>
<li>If num was integer and char was character <strong>scanf() will return 2</strong>.  </li>
<li>If one was wrong and the other right <strong>scanf() will return 1</strong>.  </li>
<li>If nothing was right and data types entered conflicted<br />    with format specifiers <strong>scanf() will return 0</strong>.</li>
</ol>
<hr /> 

<h2 id="heading-clearing-the-buffer">Clearing the buffer</h2>
<p>If we want to clear the buffer in memory of I/O device after entering character 
we should make a space before char placeholder (" %c")
or use the following snippet</p>
<pre><code> <span class="hljs-keyword">while</span>(getchar() != <span class="hljs-string">'\n'</span>)
</code></pre>

# Important Notes in C:   

## scanf() Returned Value
`scanf() will return 0 `   
If the input the user written doesn't match the format specifier    
`%i or %d or %c` or whatever   
like ( **int** was expected but it was **char** instead)  
**In this example**:  
 `("enter number %i and character %c", %num, %char);`  
1. If num was integer and char was character **scanf() will return 2**.  
2. If one was wrong and the other right **scanf() will return 1**.  
3. If nothing was right and data types entered conflicted  
       with format specifiers **scanf() will return 0**.

<hr> 

## Clearing the buffer
If we want to clear the buffer in memory of I/O device after entering character 
we should make a space before char placeholder (" %c")
or use the following snippet

```
 while(getchar() != '\n')
```