Manipulating std::string Objects

The append() Method vs += Operator

What is the difference between append() and += operator for strings in C++?

Abstract art representing computer programming

Both append() and += are used to concatenate strings in C++, but there are some differences in their usage and performance.

append() Method

The append() method is a member function of the std::string class. It allows you to add characters or another string to the end of the string on which it is called. For example:

#include <iostream>
#include <string>

int main(){
  std::string Greeting{"Hello"};
  Greeting.append(" World");
  std::cout << Greeting;
}
Hello World

Variants

The append() method has multiple overloads:

  • Appending a substring.
  • Appending multiple characters.
  • Appending a range of characters.
#include <iostream>
#include <string>

int main(){
  std::string Greeting{"Hello"};
  Greeting.append("!!!", 2);
  std::cout << Greeting;
}
Hello!!

+= Operator

The += operator is a shorthand for concatenation. It is syntactically cleaner and often used for simple concatenations. For example:

#include <iostream>
#include <string>

int main(){
  std::string Greeting{"Hello"};
  Greeting += " World";
  std::cout << Greeting;
}
Hello World

Performance

  • The append() Method: May be more efficient for complex operations, especially when concatenating parts of strings or characters.
  • The += Operator: Easier and more readable for simple concatenations.

Use Cases

  • Use += for readability and simplicity in straightforward cases.
  • Use append() for more control and when using specific overloads.

In summary, both methods are useful, and choosing one depends on your specific needs and preferences for readability and performance.

Answers to questions are automatically generated and may not have been reviewed.

A computer programmer
Part of the course:

Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.

Free, unlimited access

This course includes:

  • 125 Lessons
  • 550+ Code Samples
  • 96% Positive Reviews
  • Regularly Updated
  • Help and FAQ
Free, Unlimited Access

Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.

Screenshot from Warhammer: Total War
Screenshot from Tomb Raider
Screenshot from Jedi: Fallen Order
Contact|Privacy Policy|Terms of Use
Copyright © 2024 - All Rights Reserved