求助

大家好！望大家多多指点。多谢<br />#include&ltAT89X51.H&gt<br />sbit&nbsp;K1=p3^0;<br />sbit&nbsp;L1=P1^0;<br />void&nbsp;main(void)<br />{while(1)<br />{if(K1==0)<br />{L1=0;}<br />else{L1=1;}<br />}}<br />运行以后为什么是这样啊！<br />Build&nbsp;target&nbsp;'Target&nbsp;1'<br />assembling&nbsp;STARTUP.A51...<br />compiling&nbsp;my-test2.c...<br />MY-TEST2.C(2):&nbsp;error&nbsp;C202:&nbsp;'p3':&nbsp;undefined&nbsp;identifier<br />MY-TEST2.C(6):&nbsp;error&nbsp;C202:&nbsp;'K1':&nbsp;undefined&nbsp;identifier<br />Target&nbsp;not&nbsp;created<br />p3,k1是未定义标示符，要怎么定义啊，谢谢

  

谢谢