C Pocket Reference by Peter Prinz & Ulla Prinz

Author:Peter Prinz & Ulla Prinz
Language: eng
Format: epub
ISBN: 9780596103965
Publisher: O'Reilly Media, Inc.
Published: 2009-03-31T16:00:00+00:00

After reading out the argument list, the function should invoke the va_end macro before returning control to the caller. The only parameter of va_end is the arglist object.

Following is an example of a function, named max, that accepts a variable number of arguments:

// Determine the maximum of a number of positive integers. // Parameters: a variable number of positive values of // type unsigned int. The last argument must be 0. // Return value: the maximum of the arguments #include <stdarg.h> unsigned int max( unsigned int first, ... ) { unsigned int maxarg, arg; va_list arglist; // The optional-argument // list object va_start( arglist, first ); // Set arglist to deliver // the first optional // argument arg = maxarg = first; while ( arg != 0 ) { arg = va_arg( arglist, unsigned );// Get an argument if ( arg > maxarg ) maxarg = arg; } va_end( arglist ); // Finished reading the // optional arguments return maxarg; }

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