How to assign a value to a string in c++

There are the following methods for assigning values ​​to strings in C: 1. Direct initialization; 2. Assignment operator; 3. Copy constructor; 4. Literals; 5. Assignment from character array; 6. Assignment from stringstream .

Assigning value to string in C

String is a basic data type widely used in C , used to store and manipulate text data. In C, there are several common methods for assigning values ​​to strings:

1. Direct initialization

The simplest method is to use direct initialization syntax:

<code class="cpp">std::string my_string = "Hello world!";</code>

2. Assignment operator

You can use the assignment operator= to assign a string to another string:

<code class="cpp">std::string new_string;
new_string = "Hello there!";</code>

3. Copy constructor

The copy constructor creates a new string whose content is the same as the original string:

<code class="cpp">std::string original_string = "Original";
std::string copied_string(original_string);</code>

4. Literal

Literals are a simplified syntax that can directly assign values ​​to strings:

<code class="cpp">auto literal_string = "This is a literal string.";</code>

5. Assign values ​​from character arrays

Data can be assigned to a string from a character array:

<code class="cpp">char c_array[] = "C-style string";
std::string from_array(c_array);</code>

6. Assignment from stringstream

Data can be extracted from a stringstream and assigned to a string:

<code class="cpp">std::stringstream ss;
ss << "Data from stringstream";
std::string from_stream;
ss >> from_stream;</code>

According to different situations, choosing the most appropriate assignment method can improve the readability and efficiency of the code.

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