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PCD
Reference Parameters
The compiler has limited support for reference parameters. This increases the readability of
code and the efficiency of some inline procedures. The following two procedures are the
same. The one with reference parameters will be implemented with greater efficiency when it is
inline.
funct_a(int*x,int*y){
/*Traditional*/
if(*x!=5)
*y=*x+3;
}
funct_a(&a,&b);
funct_b(int&x,int&y){
/*Reference params*/
if(x!=5)
y=x+3;
}
funct_b(a,b);
Variable Argument Lists
The compiler supports a variable number of parameters. This works like the ANSI requirements
except that it does not require at least one fixed parameter as ANSI does. The function can be
passed any number of variables and any data types. The access functions are VA_START,
VA_ARG, and VA_END. To view the number of arguments passed, the NARGS function can be
used.
/*
stdarg.h holds the macros and va_list data type needed for variable
number of parameters.
*/
#include <stdarg.h>
A function with variable number of parameters requires two things. First, it requires the ellipsis
(...), which must be the last parameter of the function. The ellipsis represents the variable
argument list. Second, it requires one more variable before the ellipsis (...). Usually you will use
this variable as a method for determining how many variables have been pushed onto the
ellipsis.
Here is a function that calculates and returns the sum of all variables:
int Sum(int count, ...)
{
//a pointer to the argument list
va_list al;
int x, sum=0;
//start the argument list
//count is the first variable before the ellipsis
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