這個程序就是報DTSY.C(55): error C171: 'break': missing enclosing loop

ID:1111118 · 發(fā)表于 2024-2-18 21:09

#include "reg52.h"
#include "MATH.h"
typedef unsigned int u16;
typedef unsigned char u8;
typedef unsigned long u32;
typedef int uf16;
typedef char uf8;
typedef long uf32;
sbit KEY1=P3^1;
sbit KEY2=P3^0;
sbit KEY3=P3^2;
sbit KEY4=P3^3;
sbit up=P2^0;
sbit down=P2^1;
#define KEY1_PRESS 1
#define KEY2_PRESS 2
#define KEY3_PRESS 3
#define KEY4_PRESS 4
#define KEY_UNPRESS 0
u8 current=0;
u8 call=0;
u8 key=0;
u8 Floordifference=0;
void delay_10us(u32 ten_us)
{
while(ten_us--);
}
u8 key_scan(u8 mode)
{
static u8 key=1;

if(mode)key=1;
if(key==1&&(KEY1==0||KEY2==0||KEY3==0||KEY4==0))
{
delay_10us(1000);
key=0;
if(KEY1==0)
return KEY1_PRESS;
else if(KEY2==0)
return KEY2_PRESS;
else if(KEY3==0)
return KEY3_PRESS;
else if(KEY4==0)
return KEY4_PRESS;
}
else if(KEY1==1&&KEY2==1&&KEY3==1&&KEY4==1)
{
key=1;
return KEY_UNPRESS;
}
return KEY_UNPRESS;
}
void exit()
{
break;
}
void assignment()
{
   while(1)
{
key=key_scan(0);
if(key==KEY1_PRESS)
{
call=KEY1_PRESS;
}
else if(key==KEY2_PRESS)
{
call=KEY2_PRESS;
}
else if(key==KEY3_PRESS)
{
call=KEY3_PRESS;
      }
else if(key==KEY4_PRESS)
{
call=KEY4_PRESS;
}
else if(KEY1==0||KEY2==0||KEY3==0||KEY4==0)
{
exit();
}
}
}
void lift()
{
assignment();
if(current<call)
{
      Floordifference=call-current;
current=call;
down=0;
delay_10us(abs(Floordifference)*5000);
}
if(current>call)
{
      Floordifference=current-call;
current=call;
up=0;
delay_10us(Floordifference*5000);
}
}
void main()
{
lift();
大家看一下。

ID:1088185 · 發(fā)表于 2024-2-19 00:39

Break 不能這樣用， Break原則上是個goto 的語句，在函數(shù)里再goto 就錯了
你可以用 #define exit() break

ID:883242 · 發(fā)表于 2024-2-19 06:13

把while(1)改成while(!(KEY1||KEY2||KEY3||KEY4))，并把while(1)內層對應語句刪掉，exit()相關語句也可以刪掉。

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