Substring extraction from a char* is a common task in programming that involves extracting a specific portion of a string or character array. This process is essential for manipulating data and performing various operations on it. In this article, we will explore the concept of substring extraction and learn how to implement it in HTML formatting.
Before we dive into the technical details, let's first understand what a substring is. A substring is a smaller string that is extracted from a larger string. For example, if we have a string "Hello World", then "Hello" is a substring of it. In programming, substrings are often used for tasks such as searching, replacing, and manipulating data.
To extract a substring from a char*, we need to specify the starting index and the length of the desired substring. The starting index is the position of the first character of the substring in the original string, and the length is the number of characters we want to extract. For example, if we want to extract the word "World" from "Hello World", the starting index would be 6 (counting from 0) and the length would be 5.
Now, let's see how we can implement substring extraction in HTML formatting. There are two ways to do this: using the <span> tag and the CSS property "text-overflow".
Using the <span> tag, we can wrap the substring within the tag and apply formatting to it. For example, if we want to extract the word "World" and highlight it in red, we can use the following code:
```
<p>Hello <span style="color: red;">World</span></p>
```
This will result in "World" being displayed in red while the rest of the string remains unchanged.
Another way to extract a substring in HTML is by using the CSS property "text-overflow". This property is used to specify how to handle text overflow when the content of an element exceeds its allocated space. By setting the value to "ellipsis", we can truncate the text and add an ellipsis at the end. For example:
```
<p style="width: 100px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;">Hello World</p>
```
This will result in the text "Hello World" being displayed as "Hello...".
Now, let's look at a practical example of substring extraction using these techniques. Suppose we have a list of names in an unordered list and we want to extract the first name from each list item. We can do this using the <span> tag and CSS property "text-overflow" as follows:
```
<ul>
<li><span style="font-weight: bold;">John</span> Doe</li>
<li><span style="font-weight: bold;">Jane</span> Smith</li>
<li><span style="font-weight: bold;">Bob</span> Johnson</li>
</ul>
```
This will result in the first name of each person being displayed in bold while the last name remains unchanged.
In conclusion, substring extraction from a char* is a crucial concept in programming and can be easily implemented in HTML formatting using the <span> tag and CSS property "text-overflow". By understanding how to extract substrings, you can perform various operations on strings and manipulate data effectively.
