How do you define characters in the C programming language?

In C language, characters can be defined in two ways:

1. Enclose characters with single quotation marks, for example:

char ch = 'A';

1. Representing characters using ASCII code, for example:

char ch = 65;  // ASCII码中65对应的字符是'A'

It is important to note that variables of character type are defined using the keyword char.