SW500010 Microchip Technology, SW500010 Datasheet - Page 384

• Manufacturer Part Number: SW500010
• Description: HI-TECH C PRO FOR PIC10/12/16
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC10/12/16r

Specifications of SW500010

• Supported Families: PIC10, PIC12, PIC16
• Core Architecture: PIC
• Software Edition: Professional
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC10/12/16
• Tool Type: Compiler
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC10, PIC12, PIC14, PIC16, PIC16E
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 019P; 778-1006; 778-1006

(347) external declaration inside function
A function contains an extern declaration. This is legal but is invariably not desirable as it restricts
the scope of the function declaration to the function body. This means that if the compiler encounters
another declaration, use or definition of the extern object later in the same file, it will no longer have
the earlier declaration and thus will be unable to check that the declarations are consistent. This
can lead to strange behaviour of your program or signature errors at link time. It will also hide any
previous declarations of the same thing, again subverting the compiler’s type checking. As a general
rule, always declare extern variables and functions outside any other functions. For example:
(348) auto variable "*" should not be qualified
An auto variable should not have qualifiers such as near or far associated with it. Its stor-
age class is implicitly defined by the stack organization. An auto variable may be qualified with
static, but it is then no longer auto.
(349) non-prototyped function declaration for "*"
A function has been declared using old-style (K&R) arguments. It is preferable to use prototype
declarations for all functions, e.g.:
This would be better written:
384
int input;
void process(int a)
{
int process(int a)
{
}
int process(input)
int input;
{
}
int input;
a = input;
/ * this would be better outside the function * /
extern int away;
return away + a;
/ * input has filescope * /
/ * local blockscope input * /
/ * this will use the local variable.
/ * warning flagged here * /
Is this right? * /
Error and Warning Messages
(Parser)
(Parser)
(Parser)