getopt函数如何使用，能找出非选项参数索引？

Question

#include
#include
#include

int main(int argc,char *argv[])
{
int opt;
while((opt=getopt(argc,argv,"n:"))!=-1)
{
printf("%s\n",argv[optind]);
}

比如
./test 3-n5 4 -n4 5 -n3 我想输出3 4 5怎么做比较好，谢谢各位！

Answer 1

 int index = 0;

int my_getopt(int argc, char *argv[], char *optstring)
{
    char c;
    int tind=0;
    index ++;
    if(index>=argc)
        return -1;
    if(argv[index][0]!='-')
    {
        return 1;
    }
    c = argv[index][1];
    while(optstring[tind] && optstring[tind]!=c)
        tind++;
    if(!optstring[tind])
        return -1;
    index += (optstring[tind+1]==':');
    return my_getopt(argc, argv, optstring);
}
int main(int argc,char *argv[])
{
    while(my_getopt(argc,argv,"n:")!=-1)
    {
        printf("%s\n",argv[index]);
    }
}