What are character constants in C language?

Character constants in the C language refer to a single character enclosed by a pair of single quotes, such as "'a'", "'D'", "'?'", "'$'"; it Represents a character in the ASCII character set, occupies 4 bytes in the memory, and stores the ASCII code (integer data) of the character. The C language stipulates that all character constants are treated as integers.

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What are character constants in c language?

Character constant: a single character (or character escape sequence or three-letter word) enclosed in single quotes

Essence (meaning): It is an integer value. It belongs to the integers among the four basic data types (integers, floating-point types, pointers, and aggregate types).

Such as 'a', '\n', '??!', '\24'

In C language, a character constant represents a character in the ASCII character set, character constant It occupies 4 bytes in the memory and stores the ASCII code of the character (integer data). The C language stipulates that all character constants are treated as integers. In C language, character data and integer data can be used interchangeably: 10 ‘R’. The essence of constants: they do not occupy any storage space; they are part of the instructions and will not be changed after compilation.

The difference between C language character constants and string constants

Character constants: In C language, a character constant represents a character in the ASCII character set. In the program, it is used as a single character constant. Quotes enclose a character as a character constant. Uppercase and lowercase letters represent different word constants; so do spaces within single quotes; character constants can only contain one character; character constants can only be enclosed in parentheses.

String constants: String constants are enclosed in double quotes. In C language, the system will automatically add a '\0' at the end of each string as the end mark of the string.

Difference: 'Z' is a character constant, occupying one byte; "Z" is a string constant, occupying two bytes, one of which contains '\0'.

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