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Technical Support On-Line Manuals C251 User's Guide ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Alien (PL/M-51) FunctionThe C251 Compiler easily interfaces with the Intel PL/M-51 Compiler and allows you to:
To invoke PL/M-51 routines from your C functions, you must first declare them external with the alien function type specifier. For example: extern alien char plm_func (int, char); char c_func (void) { int i; char c; for (i = 0; i < 100; i++) { c = plm_func (i, c); /* call PL/M func */ } return (c); } To create C functions that may be invoked from your PL/M-51 routines, you must use the alien function type specifier in the C function declaration. For example: alien char c_func (char a, int b) { return (a * b); } Parameters and return values of PL/M-51 functions may be bit, char, unsigned char, int, and unsigned int. Other types, including long, float, and all types of pointers, can be declared in C functions with the alien type specifier. However, use these types with care because PL/M-51 does not directly support 32-bit binary integers or floating-point numbers. Public variables declared in the PL/M-51 module are available to your C programs by declaring them external like you would for any C variable. | ||||||||||
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