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What You Need To Know About Clear Methods In C++ Software

What You Need To Know About Clear Methods In C++ Software

How can I clear a string in a simple way? What kind of methods I can use in my C++ software to clear a std::string? How can I use clear() method with strings? Can I use resize() method to clear strings? How can I use erase() method to clear 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 clear a string by using clear() methods.

How to clear the contents of a string with the clear() Method in a C++ app?

The clear() method is a String Method that removes all characters from the string as same as setting string to “”. It doesn’t have parameter and it doesn’t return a value; After using clear() method pointers, references, and iterators related with it are invalidated.


We can simply clear characters of a string by using its clear() method as below.

Here we can clear characters of a string by using its clear() method as given full example below,

How do I clear a string by setting String to “” in C++ software?

In Modern C++, Simply we can clear a string by setting it to “”, Here is an example below,

How to clear the contents of a string with the C++ resize() method?

We can use resize() method to set string size. We can use 0 to clear it, here is an example below,

How do I clear a string with the erase() method in C++?

We can clear a string by using erase() method with begin() and end() iterators as it’s parameters.

A comparison of Clear Methods of Strings in C++

We can compare all those clear methods in an example. Here we prepared a use str_info() function to display string details after each operation. We can use empty() method if the string is empty or not. Here is the full example to see each methods;


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About author

Dr. Yilmaz Yoru has 35+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux, and some other operating systems. He was born in 1974, Eskisehir-Turkey, started coding in college and graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. He worked as a research assistant at the same university for more than 10 years. He received his MSc and PhD degrees from the same department at the same university. Since 2012, he is the founder and CEO of Esenja LLC Company. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics, Artificial Intelligence, 2D & 3D Designs, and high-end innovations.
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