Usage of single quotes and double quotes in c language

Abstract: Single quotes and double quotes in C language are used to define string constants. Single quotes define a character array with a limited length, which is stored in the data area and can be modified; double quotes define a character array stored in the code area. String constant, unlimited length, cannot be modified, and can contain escape characters.

Usage of single quotes and double quotes in C language

Get straight to the point:

Single quotes (') and double quotes (") are used to define string constants in C language, but each has different usage and meaning.

Detailed expansion:

Single quotation marks (')

• Define a character array with a length of no more than 255 characters, each character occupies one byte
#. ##The characters in the character array end with '\0'.
• is often used to define short strings or single characters.

##Double quotes (")

Define string constants, which are stored in the code area of ​​the program.

• String constants end with '\0'.
• is often used to define longer strings or strings containing special characters.

Differences and precautions:

Length limit:
• The character array defined by single quotes has a length limit, while double quotes There is no length limit for string constants defined by quotation marks.
Memory allocation:
• Character arrays defined by single quotes are stored in the data area, while string constants defined by double quotes are stored in the code area.
Special characters:
• Double quotes can be used to define strings containing escape characters (such as \n, \t), but single quotes cannot.
Modability:
• The character array defined by single quotes can be modified, but the string constant defined by double quotes cannot be modified.

Example:

Single quotes:

<code class="c">char str1[] = 'Hello'; // 定义一个长度为 6 的字符数组</code>

Double quotes:

<code class="c">char* str2 = "Hello World!"; // 定义一个指向字符串常量的指针</code>

It should be noted that in C language, string constants are immutable and their contents cannot be changed once defined.

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