A character enclosed in a pair of single quotes is a constant expression that is evaluated to the numeric code of that character in the character set that the implementation uses (e.g., ASCII, EBCDIC). For instance:
int n = 'A'; // n = 65 on systems using ASCII The variable n is initialized with the numeric code of the letter A, which is 65 in ASCII. Likewise, you can obtain the numeric codes of numbers:
int n = '9'; // n = 57Remember not to confuse a single quote with double quotes, which indicate a string literal, not an integral value:
char str[] = "hello world";int n = 'h'+'e'+'l'+'l'+'l'+'o'; // n equals 640
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