The difference between 'a' and "a" in C language

'a' and "a" represent different character constants in the C language: 'a' is a character, and "a" is a string containing one character. They differ in type, storage, usage, syntax, and examples.

The difference between single quotation mark 'a' and double quotation mark "a"

'a' and "a" There are different character constants in C language. The main differences between them are as follows:

1. Type

• 'a' is a character constant, Represents the single character 'a'.
• "a" is a string constant, representing a string consisting of one character 'a'.

2. Store

• 'a' is stored as an 8-bit ASCII code value 97.
• "a" is stored as a character array where the first element is 97 and the second element is 0 (null character).

3. Use

• #'a' to represent a single character, such as in a single-character variable or as a character in a string .
• "a" is used to represent a string, such as in a string variable or as a literal string in a program.

4. Syntax

• 'a' Use single quotes, for example: 'a'.
• "a" Surrounded by double quotes, for example: "a".

5. Example

char ch = 'a'; // 将 'a' 存储在字符变量 ch 中
char *str = "a"; // 将字符串 "a" 存储在字符串变量 str 中

Summary:

'a' and "a" in C language are different character constants, 'a' is a character and "a" is a string containing one character. They differ in type, storage, usage, syntax, and examples.

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