How to have no delay in program.

hi.

what step's have no delay in program. 

code: [select]


int led = 3;
int sound = a0;
int threshold = 400;
int sensorvalue = 0;

void setup()
{
    serial.begin(9600);
    pinmode(led,output);
    pinmode(sound,input);
}
void loop()
{
       int sensorvalue = analogread(sound);
serial.print("sensorvalue ");
        serial.println(sensorvalue);
       
if(sensorvalue > threshold)
{
           digitalwrite(led, high);
           delay(100);

}
           digitalwrite(led, low);
            delay(10);
        }     
 

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