example getprotoent() program

//getprotoent()
#include
#include

int main(int argc,char *argv[])
{
        struct protoent* p;
        int a;

        while(1)
        {
                p=getprotoent();
                if(p==NULL)
                        break;

                        printf("%s:/n/tProtocol:%d/n/t",p->p_name,p->p_proto);
                        for(a=0;p->p_aliases[a]!=NULL;a++)
                                printf("Aliasses:%s/n",p->p_aliases[a]);
        }
}