C程序——简单海龟作图

活动区域5050，超出区域，海龟死亡
#include<stdio.h>
void print(int [][51]);
void move(int [][51],int,int,int);

int x=0,y=0;  //海龟位置坐标，为全局变量，初始在左上角。
int main()
{
int step[51][51];
int i,j,a=1,gostep=1,direct=1,record=1;
for(i=0;i<=49;i++)
  for(j=0;j<=49;j++)
  step[i][j]=0;
  for(;;){      printf("a=%d,gostep=%d,direct=%d,record=%d,x=%d,y=%d\n",a,gostep,direct,record,x,y);   
   printf("请输入 a ");
   scanf("%d",&a);
   
   if(a==2) record=1;
   if(a==1) record=0;
   if(a==4)
   {
    direct++;
        if(direct==5) direct=1;
continue;
   }
   if(a==3)
   {
  direct--;
      if(direct==0) direct=4; 
  continue;