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#include "REG52.h"
sbit K1 = P3^0;
sbit K2 = P3^1;
sbit K3 = P3^2;
sbit K4 = P3^3;
void main()
{unsigned char Xd=0,xz=0,cs=0;unsigned int wei=0;P1=255;while(1){if(K1==0&&++Xd==0){P1=0;while(K1==0);}if(K2==0&&++Xd==0){P1=85;while(K2==0);}if(K3==0&&++Xd==0){P1=15;while(K3==0);}if(K4==0&&++Xd==0){P1=240;while(K4==0);}}
}