程序代码：

#include <stdio.h>
#include <stdarg.h>

#define     reg     register

int
array_offset( int arrayinfo[], ... );

int
main()
{
    int a[7] = { 3, 0, 3, 1,4, 2,6};
    printf( "array_offset( a, 2, 3, 4 )=%d \n ", array_offset( a, 2, 3, 4 ) );
    return 0;
}

int
array_offset( int arrayinfo[], ... )     //可变参数类型
{
    reg     int     ndim;
    reg     int     offset;
    reg     int     lo, hi;
    reg     int     i;
    int     s[ 10 ];
    va_list subscripts;

    ndim = *arrayinfo++;
    printf("ndim:%d\n",ndim);

    if( ndim >= 1 && ndim <= 10 )                  //arrayinfo[0]指定伪数组具有的维数，值必须在1和10之间
    {
        va_start( subscripts, arrayinfo );         //初始化
        //printf("subscripts:%c\n",subscripts);

        for( i = 0; i < ndim; i++ )
        {
            s[i] = va_arg( subscripts, int );      //subscripts指向下一个参数，以及下一个参数的类型
            printf("s[%d]=%d\n",i,s[i]);
        }

        va_end( subscripts );

        offset = 0;
        for( i = 0; i < ndim; i++ )
        {
            lo = *arrayinfo++;
            hi = *arrayinfo++;
            if( s[i] < lo || s[i] > hi )
            {
                return -1;
            }

            offset *= hi - lo + 1;
            offset += s[i] - lo;
        }
        return offset;
    }
    return -1;
}