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51 single chip microcomputer program - use buttons to control the start and stop of the buzzer

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#include 
#define uint unsigned int //macro definition
sbit SPK=P3^5;            //define speaker port
sbit key=P3^1;            //The corresponding key on the development board is s18
 
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
 
void main()
{
   while(1)
   { 
if(key==0)
{
       delay(100); 
   SPK=0;
delay(100);
       SPK=1;
}
else
{
SPK=1;
}
   }
}
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