上海学车哪家驾校好:大家帮我看看这个C语言小程序哪个地方出现了死循环

#include<stdio.h>
#define NULL 0
struct hz { int bh;
int zg;
struct hz *p;};
struct hz *jllb(int m)
{struct hz *pb,*pf,*head;
int i;
for(i=1;i<=m;i++)
{pb=(struct hz*)malloc(sizeof(struct hz));
pb->bh=i;
pb->zg=1;
pb->p=NULL;
if(i==1)pf=head=pb;
else pf->p=pb;
pf=pb;}
return head;}

int hwzg(int m,int n)
{int i,sum=0;
struct hz *pf,*head,*pb;
head=jllb(m);
pb=head;
while(sum!=1)
{i=0;
while(i<=n)
{if(pb->zg==1) i++;
if(pb->p!=NULL) pb=pb->p;
else pb=head;}
pb->zg=0;
for(pf=head,sum=0;pf->p!=NULL;pf=pf->p)
sum+=pf->zg;
sum=sum+pf->zg;}
for(pf=head;pf->zg==0;pf=pf->p);
printf("sum=%d",sum);
return pf->bh;}

main()
{int m,n;
printf("请输入猴子个数m和报数n,用逗号间隔");
scanf("%d,%d",&m,&n);
printf("猴王的编号为：%d",hwzg(m,n));}
谢谢你了tonybird333，我已经找到问题了，改正后的如下：
#include<stdio.h>
#define NULL 0
struct hz { int bh;
int zg;
struct hz *p;};
struct hz *jllb(int m)
{struct hz *pb,*pf,*head;
int i;
for(i=1;i<=m;i++)
{pb=(struct hz*)malloc(sizeof(struct hz));
pb->bh=i;
pb->zg=1;
pb->p=NULL;
if(i==1)pf=head=pb;
else pf->p=pb;
pf=pb;}
return head;}

int hwzg(int m,int n)
{int i,sum=0;
struct hz *pf,*head,*pb;
head=jllb(m);
pb=head;
while(sum!=1)
{i=0;
while(i<n)
{if(pb->zg==1) i++;
if(pb->p!=NULL)pf=pb,pb=pb->p;
else pf=pb,pb=head;}
pf->zg=0;
for(pf=head,sum=0;pf->p!=NULL;pf=pf->p)
sum+=pf->zg;
sum=sum+pf->zg;}
for(pf=head;pf->zg==0;pf=pf->p);
printf("sum=%d",sum);
return pf->bh;}

main()
{int m,n;
printf("请输入猴子个数m和报数n,用逗号间隔");
scanf("%d,%d",&m,&n);
printf("猴王的编号为：%d",hwzg(m,n));}