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| // Example http://msdn.micrsoft.com/ | |
| /* VA.C: The program below illustrates passing a variable | |
| * number of arguments using the following macros: | |
| * va_start va_arg va_end | |
| * va_list va_dcl (UNIX only) | |
| */ | |
| #include <stdio.h> | |
| #define ANSI /* Comment out for UNIX version */ | |
| #ifdef ANSI /* ANSI compatible version */ | |
| #include <stdarg.h> | |
| int average( int first, ... ); | |
| #else /* UNIX compatible version */ | |
| #include <varargs.h> | |
| int average( va_list ); | |
| #endif | |
| void main( void ) | |
| { | |
| /* Call with 3 integers (-1 is used as terminator). */ | |
| printf( "Average is: %d\n", average( 2, 3, 4, -1 ) ); | |
| /* Call with 4 integers. */ | |
| printf( "Average is: %d\n", average( 5, 7, 9, 11, -1 ) ); | |
| /* Call with just -1 terminator. */ | |
| printf( "Average is: %d\n", average( -1 ) ); | |
| } | |
| /* Returns the average of a variable list of integers. */ | |
| #ifdef ANSI /* ANSI compatible version */ | |
| int average( int first, ... ) | |
| { | |
| int count = 0, sum = 0, i = first; | |
| va_list marker; | |
| va_start( marker, first ); /* Initialize variable arguments. */ | |
| while( i != -1 ) | |
| { | |
| sum += i; | |
| count++; | |
| i = va_arg( marker, int ); /* get an integer argument */ | |
| } | |
| va_end( marker ); /* Reset variable arguments. */ | |
| return( sum ? (sum / count) : 0 ); | |
| } | |
| #else /* UNIX compatible version must use old-style definition. */ | |
| int average( va_alist ) | |
| va_dcl | |
| { | |
| int i, count, sum; | |
| va_list marker; | |
| va_start( marker ); /* Initialize variable arguments. */ | |
| for( sum = count = 0; (i = va_arg( marker, int)) != -1; count++ ) | |
| sum += i; | |
| va_end( marker ); /* Reset variable arguments. */ | |
| return( sum ? (sum / count) : 0 ); | |
| } | |
| #endif | |
| // Output | |
| // | |
| // Average is: 3 | |
| // Average is: 8 | |
| // Average is: 0 |
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