CCS C Compiler Manual PCB / PCM / PCH

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
va_start(al, count);
while(count--) {
//get an int from the list
x = var_arg(al, int);
sum += x;
}
//stop using the list
va_end(al);
return(sum);
}
Some examples of using this new function:
x=Sum(5, 10, 20, 30, 40, 50);
y=Sum(3, a, b, c);
40