Datasheet

Appendix C. The C Language

that long. Of course, this can have very unfortunate side effects. But C has great faith that you knew what

you were doing when you wrote that.

C.2. Identifiers

Variables and functions in C are assigned names called identifiers. ANSI C sets some minimum

requirements for identifiers, but also allows some implementation flexibility. As a general rule, XC16

makes maximum use of that flexibility.

An identifier is a sequence of letters and/or digits which must begin with a letter. The underbar (_)

character counts as a letter.[KandR] Identifiers may be of any length, and all characters are significant.

[MCP1] (The ANSI standard requires at least the first 31 characters be significant). Identifiers are case

sensitive.

C.3. Types, Operators and Expressions

C.3.1. Scalar types

There are two general categories of values within C; integer and floating point. Within those categories are

a number of different types. What those types actually mean is somewhat implementation dependent. For

example, int is an integer of the natural size for the target processor. long is an integer the same size

as int or longer, short the same size as int or shorter.

For XC16 the following are the integer types:[MCP1]

Table C.1. Integer Types

Type Bits Min Max

char 8 -128 127

signed char 8 -128 127

unsigned char 8 0 255

short 16 -32768 32767

signed short 16 -32768 32767

unsigned short 16 0 65536

int 16 -32768 32767

signed int 16 -32768 32767

unsigned int 16 0 65535

long 32 -2147483648 2147483647

signed long 32 -2147483648 2147483647

unsigned long 32 0 4294967296

long long 64 -9223372036854775808 9223372036854775807

signed long long 64 -9223372036854775808 9223372036854775807