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Built-in Functions
Function:
Availability:
Requires:
Examples:
Performs an optimized multiplication. By accepting a different type
than it returns, this function avoids the overhead of converting the
parameters to a larger type.
All devices
Nothing
int a=50, b=100;
long int c;
c = _mul(a, b);
//c holds 5000
Example
Files:
Also See:
nargs( )
Syntax:
None
None
void foo(char * str , int count , ...)
Parameters: The function can take variable parameters. The user can use stdarg library to
create functions that take variable parameters.
Returns:
Function:
Function dependent.
The stdarg library allows the user to create functions that supports variable
arguments.
The function that will accept a variable number of arguments must have at least
one actual, known parameters, and it may have more. The number of arguments
is often passed to the function in one of its actual parameters. If the variable-length
argument list can involve more that one type, the type information is generally
passed as well. Before processing can begin, the function creates a special
argument pointer of type va_list.
Availability: All devices
Requires:
Examples:
#INCLUDE <stdarg.h>
int foo(int num, ...)
{
int sum = 0;
int i;
va_list argptr;
// create special argument pointer
va_start(argptr,num);
// initialize argptr
for(i=0; i<num; i++)
sum = sum + va_arg(argptr, int);
va_end(argptr);
// end variable processing
209
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