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keil51 c程序 矩阵和键盘显示

/*程序名：矩阵键盘显示*/
/*程序功能：用P1口构成矩阵键盘，P0口作显示，按下按键显示对应按键码*/
/*作者：严峥晖*/
#include<reg51.h>
typedef unsigned char uchar;
uchar code led[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};//共阴极LED字段码
void delay(void)
{
  uchar i,j;
  for(i=0;i<=25;i++)
    for(j=0;j<=200;j++); 
}
uchar key()
{
  uchar temp,temp1,temp2;
  uchar out;
  P2=0xf0;
  temp1=P2&0xf0;
  P2=0x0f;
  temp2=P2&0x0f;
  temp="temp1|temp2";
  if(temp!=0xff)
  {
    delay();
    P2=0xf0;
    temp1=P2&0xf0;
    P2=0x0f;
    temp2=P2&0x0f;
    temp="temp1|temp2";
  if(temp!=0xff)
    {
      switch(temp)
      {
       case 0xee:out=0;break;
    case 0xed:out=1;break;
    case 0xeb:out=2;break;
    case 0xe7:out=3;break;
    case 0xde:out=4;break;
    case 0xdd:out=5;break;
    case 0xdb:out=6;break;
    case 0xd7:out=7;break;
    case 0xbe:out=8;break;
    case 0xbd:out=9;break;
    case 0xbb:out=10;break;
    case 0xb7:out=11;break;
    case 0x7e:out=12;break;
    case 0x7d:out=13;;break;
    case 0x7b:out=14;break;
    case 0x77:out=15;break;
    default:out=16;break;
      }
      return out;
 }
    else 
    {
      out="16";
      return out;
    }
  }
  else
  {  
    out="16";
    return out;
  }
}
int main(void)//主程序
{
  for(;;)
  {
    P0=led[key()];
  }
}