Explore the full potential of C++ by mastering the standard library.

Become a C++ Programmer

The C++ standard library is a collection of all the tools and utilities available in C++. It received its latest update in 2017, known as C++17. The update introduces many new features that further optimize our code. This module will help us fully grasp C++ and use it to its full potential.

C++ Standard Library

#include <iostream>
#include <string>

int main(){

  std::cout << std::endl;

  std::string str;
  
  // std::string::size_type idx= str.find("no");
  auto idx = str.find("no");

  if (idx == std::string::npos) std::cout << "no not found " << std::endl;
  
  std::cout << std::endl;
  
  str = {"dkeu84kf8k48kdj39kdj74945du942"};
  std::string str2{"84"};
  
  std::cout << "str: " << str <<  std::endl;
  std::cout << "str2: " << str2 << std::endl;
  
  std::cout << "str.find('8'): " << str.find('8') << std::endl;
  std::cout << "str.rfind('8'): " << str.rfind('8') << std::endl;
  std::cout << "str.find('8', 10): " << str.find('8', 10) << std::endl;
  std::cout << "str.find(str2): " << str.find(str2) << std::endl;
  std::cout << "str.rfind(str2): " << str.rfind(str2) << std::endl;
  std::cout << "str.find(str2, 10): " << str.find(str2, 10) << std::endl;
  
  std::cout << std::endl;
  
  str2 = "0123456789";
  std::cout << "str: " << str << std::endl;
  std::cout << "str2: " << str2 << std::endl;
  
  std::cout << "str.find_first_of(678): " << str.find_first_of("678") << std::endl;
  std::cout << "str.find_last_of(678): " << str.find_last_of("678") << std::endl;
  std::cout << "str.find_first_of(678, 10): " << str.find_first_of("678", 10) << std::endl;
  std::cout << "str.find_first_of(str2): " << str.find_first_of(str2) << std::endl;
  std::cout << "str.find_last_of(str2): " << str.find_last_of(str2) << std::endl;
  std::cout << "str.find_first_of(str2, 10): " << str.find_first_of(str2, 10) << std::endl;

  std::cout << std::endl;
  
  std::cout << "str: " << str << std::endl;
  std::cout << "str2: " << str2 << std::endl;
  
  std::cout << "str.find_first_not_of(678): " << str.find_first_not_of("678") << std::endl;
  std::cout << "str.find_last_not_of(678): " << str.find_last_not_of("678") << std::endl;
  std::cout << "str.find_first_not_of(678, 10): " << str.find_first_not_of("678", 10) << std::endl;
  std::cout << "str.find_first_not_of(str2): " << str.find_first_not_of(str2) << std::endl;
  std::cout << "str.find_last_not_of(str2): " << str.find_last_not_of(str2) << std::endl;
  std::cout << "str.find_first_not_of(str2, 10): " << str.find_first_not_of(str2, 10) << std::endl;
  
  std::cout << std::endl;
  
}

# Explanation

In the above code, we have used all variations of the `find` function. We have taken two strings, i.e., `str` and `str2` for checking all the variations.

In this lesson, we'll discuss the solution to the problem discussed in the previous lesson.

The Standard Library

Overview

Application of Libraries

Useful Functions

Adaptors for Functions

Pairs and Tuples

Reference Wrappers

Smart Pointers

Type Traits

Time Library

std::any, std::optional, and std::variant

Containers in General

Sequential Containers

Associative Containers in General

Ordered Associative Containers

Unordered Associative Containers

Adaptors for Containers

Iterators

Callable Units

Algorithms

Non-Modifying Algorithms

Modifying Algorithms

More Algorithms

New Algorithms with C++17

Numeric

Strings

String View

Regular Expressions

Input and Output Streams

Conclusion

- Solution

Solution #