C++C++11C++14C++17Introduction to C++Learn C++

How To Use find_first_of() And find_last_of() In C++ Apps

How can I search only a single character in a string in my C++ apps? What kind of methods I can use to find a character in a std::string? How can I use find_first_of(), find_last_of() methods with strings?

Modern C++ uses Strings, Wide Strings, and Unicode Strings to support worldwide languages. Strings (std::string) uses char as the character type which means they are ASCII chars and they are an instantiation of the basic_string class template. In C++, there are several typedefs for common character types and one of them is std::string types that are defined in header <string>.

strings are the string class for byte characters represented with string and alphanumeric characters are stored and displayed in string forms. In other terms, string stores the alphanumeric text with 1-byte chars called char. Strings are the instantiation of the basic_string class template that uses char as the character type. In modern C++, simply we can define a string as below,

Strings (string) are a class contains arrays of characters with useful methods, and we can access, or modify their characters easily. In C++, while string contents are defined between ” and “, characters are defined between ‘ and ‘.

The string has methods to append, assign, copy, align, replace or operate with other strings. These methods can be used in all string methods with their appropriate syntax. We can find characters in a string by using find_first_of() and find_last_of() methods.

How to search a string with the find_first_of() method in C++?

The find_first_of() Method is a String Method that finds the first character of a string (a character sequence) in another string. In this method it searches only for a single character in a string. If the character is not present in the string it returns the npos of the string (std::string::npos).

Simply we can find a character of a string in another string by using its find_first_of() method as given syntax.

What is the syntax of find_first_of()?:

Here we can find a character of a string in another string by using its find_first_of() method as given full example below.

The output of this code will be as below,

As you see here, we find the first ‘r’ character in our string at the position 3

How do I search a string with the find_last_of() method in C++?

The find_last_of() Method is a String Method that finds the last character of a string (a character sequence) in another string. In this method it search only a single character while the search is a string. If the character is not present in a string it, returns the npos of the string (std::string::npos).

Simply we can find a character of a string in another string by using its find_last_of() method as given syntax.

What is the syntax of the find_last_of() C++ method?

Here we can find a character of a string in another string by using its find_last_of() method as given full example below.

The output of this code will be as below,

as you see we found the last ‘r’ character which is in “.org” part at the position 16.

close

Oh hi there 👋
It’s nice to meet you.

Sign up to receive awesome C++ content in your inbox, every day.

We don’t spam! Read our privacy policy for more info.


Reduce development time and get to market faster with RAD Studio, Delphi, or C++Builder.
Design. Code. Compile. Deploy.
Start Free Trial

Free C++Builder Community Edition

About author

33+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux and some other operating systems. Dr. Yilmaz Yoru was born in 1974, Eskisehir-Turkey. He graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. One year later he started to work in the same university as an assistant. He received his MSc and PhD degrees from the same department of the same university. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics and Artificial Intelligence. He also likes the graphical 2D & 3D design and high-end innovations.
Related posts
CC++Introduction to C++Learn C++

Who Wrote The C Programming Language?

CC++Introduction to C++Language FeatureLearn C++

Is C A High Level Programming Language?

CC++Introduction to C++Learn C++

How To Run A C Program in Command Prompt

CC++C++17Learn C++

How To Compile And Run A C Program