C 的走迷宫问题 实在找不出问题所在了。。。

mice.txt文件内容
24 24 1 1 24 1
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0
1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0

（感觉是search的问题 但找不出问题）

#include
#include
int V=0;

int xnum;
int ynum;
int a[100][100];

typedef struct
{
int x;
int y;
}NODE;
typedef struct
{
NODE nownode;
NODE prenode;
int dir;
}GRID;
NODE start;
NODE end;
GRID grid;

void Init()
{

FILE *fp;
fp=fopen("mice.txt","r");
fscanf(fp,"%d%d%d%d%d%d",&xnum,&ynum,&start.x,&start.y,&end.x,&end.y);//24 24 1 1 24 1
int i,j;
for(j=0;j<=ynum+1;j++)
    for(i=0;i<=xnum+1;i++)
        a[j][i]=1;
for(j=1;j<=ynum;j++)
    for(i=1;i<=xnum;i++)
        fscanf(fp,"%d",&a[j][i]);
//grid.nownode.x =start.x;
//grid.nownode.y=start.y;   
    grid.nownode=start;
fclose(fp);

}

void search(int x,int y){

if((x==24)&&(y==1))
V=1;
else{
    a[x][y]=1;
    if((V==0)&&(a[x][y+1]==0)) //向右查找----------v==0 可避免在V==1时的不必要搜索 第一个if里的可略 
      search(x,y+1);
    if((V==0)&&(a[x+1][y]==0))//向下查找
      search(x+1,y);
    if((V==0)&&(a[x][y-1]==0)) //向左查找
      search(x,y-1);
    if((V==0)&&(a[x-1][y]==0)) //向上查找
      search(x-1,y); 
}   
a[x][y]=0;
if(V=1)
a[x][y]=2;

}

int main()
{
int x,y;
Init();
x=grid.nownode.x;
y=grid.nownode.y;
printf("%d %d\n",start.x,start.y);
printf("%d %d %d \n",a[24][1],a[24][0],a[25][1]);
printf("%d \n",V);
search(x,y);

for(int i=0;i<=xnum+1;i++)

{
for(int j=0;j<=ynum+1;j++)
printf("%d",a[i][j]);
printf("\n");
}

scanf("%d",&x);
return 0;
}

search函数里，

 if(V=1)

应该是双等号吧

 if(V==1)