C's String Function: Extracting a Portion of a String

C's String Function: Extracting a Portion of a String

In the realm of C++ programming, the function is a valuable asset for handling string-related problems. This function, part of the C++ Standard Library, allows developers to extract sub-strings from a given string, either after or before a specific character.

One common interview question involves writing a program that prints all non-empty substrings of a given string. The function is an ideal tool for tackling such problems, as it provides a straightforward way to break down a string into smaller parts.

Let's delve into some examples of using the function to get sub-strings in different ways.

Suppose we have the string "example". To get the sub-string after the third character, we can use the following code:

```cpp

int main() { std::string str = "example"; int pos = 3; std::cout << str.substr(pos) << std::endl; return 0; } ```

This code will output "ample".

Similarly, to get the sub-string before the third character, we can use:

```cpp

int main() { std::string str = "example"; int pos = 3; std::cout << str.substr(0, pos) << std::endl; return 0; } ```

This code will output "exam".

The function also finds application in more complex problems, such as calculating the sum of all possible substrings of a given integer represented as a string.

The article discussing the function in C++ is categorised under the topic of C++ programming and is related to C++-Library, cpp-string, C-String, and C-Library. The article, titled "Exploring the Function in C++: A Useful Tool for String Manipulation", was authored by AKASH GUPTA, with additional contributions from Narasimha Karumanchi. The article features an example program, "Print all Sub-Strings of a Given String", which was developed by Narasimha Karumanchi in the CPP-Library.

In conclusion, the function in C++ is a versatile and essential tool for handling string-related problems. Whether you're a seasoned programmer or a novice just starting out, mastering the function will undoubtedly enhance your C++ programming skills.

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