Texas Instruments MSP50C614 manual 4 C± ± Directives, Without Arguments, With Arguments

C± ± Compiler

5.9.4C± ± Directives

C± ± has a limited number of directives and some additional directives not found in ANSI C compilers. The following directives are recognized by the compiler.

5.9.4.1#define

This directive is used to introduce 2 types of macros, in typical C fashion:

Without Arguments:

defines a replacement string for a given string

Example:

#define PI 3.1415926535

Every occurrence of the token PI will henceforth be replaced with the string 3.1415926535.

If there is no replacement string, the given string is deemed defined: this can be used in conjunction with the #ifdef / #ifndef directives. It is also possible to undefine a macro with the #undefine directive.

With Arguments:

The macro name must be immediately followed by a pair of parenthesis, which introduces the arguments. This is completely compatible with the usual C definition.

Example:

#define modulo(i,j) (i%j)

Every occurrence of the word modulo followed by an expression in parentheses will be replaced by (i%j), where i is the first argument in the parenthesis, and j the second argument. modulo((a*b),c) will thus be replaced by ((a*b)%c).

5.9.4.2#undefine

The string following this directive is removed from the list of macros. There is no warning if the string is not found in the macro list.

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