In C language, the char type is used in strings: 1. Store a single character; 2. Use an array to represent a string and end with a null terminator; 3. Operate through a string operation function; 4. Read or output a string from the keyboard.
The role of char in C language strings
In C, char is a data type used to represent a single character. In a string, an array of type char is used to store a sequence of characters.
effect
char mainly plays the following role in C language strings:
- Store characters: Each element in the char array stores one character.
- Represents string: Character arrays usually end with a null terminator (
\0
) to represent the end of a string. - String operations: A char array can be operated through various string manipulation functions, such as strcpy(), strcmp(), and strlen().
- Input/Output: A character array can be used to read strings from the keyboard or print strings to the screen.
Example
The following code example demonstrates how to use a char array to store strings:
<code class="c">char str[] = "Hello, world!";</code>
This array contains 13 characters (including the null terminator).
Things to note
- The char array must end with a null terminator to indicate the end of the string.
- When accessing strings, make sure that the boundaries of the array are not exceeded.
- The char array is different from the std::string class in C, which provides a higher level of string manipulation capabilities.
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