Vararg process example.

Find out the max num from input varargs,the function prototype:int max_list(int values,...);

"-1" indicates the end of a input of varargs.

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

int max_list(int values,...)
{
    va_list var_arg;
    int max = 0,tmp = 0;

    va_start(var_arg,values);

    while(( tmp = va_arg(var_arg,int)) >= 0 )
    {
        if(max < tmp)
        {
            max = tmp;
        }
    }

    va_end(var_arg);

    return max;
}

int main()
{
    int max_arg = 0;

    max_arg = max_list(1,9,3,5,-1);

    printf("the max_arg is:%d\n",max_arg);

    return 0;
}