c语言很诡异

   感觉c学的很不好，但是为什么看似很浅显的东西，竟然有问题，好晕。

 #include<stdlib.h>

#include<stdio.h>

#define MAXQUEUE 70

 

struct node

{

int vertex;

struct node *nextnode;

};

typedef struct node *graph;

struct node head[61];

int visited[61];

 

int queue[MAXQUEUE];

int front=-1;

int rear=-1;

 

void creategraph(int *node,int num)

{

graph newnode;

graph ptr;

int from;

int to;

int i;

 

for(i=0;i<num;i++)

{

from=node[i*2];

to=node[i*2+1];

 

newnode=(graph)malloc(sizeof(struct node));

newnode->vertex=to;

newnode->nextnode=NULL;

ptr=&(head[from]);

while(ptr->nextnode!=NULL)

ptr=ptr->nextnode;

ptr->nextnode=newnode;

}

}

 

void bfs(int current)

{

graph ptr;

 

enqueue(current);

visited[current]=1;

printf("%d",current);

while(front!=rear)

{

current=dequeue();

ptr=head[current].nextnode;

while(ptr!=NULL)

{

if(visited[ptr->vertex]);

{

enqueue(ptr->vertex);

visited[ptr->vertex]=1;

printf("%d",ptr->vertex);

}

ptr=ptr->nextnode;

}

}

}

 

截图：

没法弄了，烦。。。