Keypad 4*4 with Ardunio

Iam Using keypad 4*4 with an Ardunio Mega,I have sensors connected to the Ardunio I want to press a key from the keypad and have response in the same time,I dont want to wait till the loop continue, I want to save up to 10 numbers entered from the keypad,So is there a way to make the keypad as an interrupt for my code?

void loop() {


char key = kpd.getKey();

if (key != NO_KEY)

{

if (key == 'C') //clear the array

{

index = 0;

numbers[index] = '\0';

}

else if (key == '.')

{



numbers[index++] = '.';

numbers[index] = '\0';

}

else if (key >= '0' && key <= '9')

{

for(int z=0; z==10;z++)

{

numbers[index++] = key;

numbers[index] = '\0';
}
}

else if (key == 'A')

{

float len = atof(numbers); //conversion from string to numeric



 if(fona.callPhone(numbers)){
    Serial.println(F("RING!"));
    Serial.print(F("Phone Number: "));



Serial.println(numbers); //print out on serial monitor
}


}
else if (key == 'D')

{
 if ( fona.pickUp()) {
          Serial.println(F("Failed"));
        } 

}else if (key == '#')

{
 if ( fona.hangUp()) {
          Serial.println(F("Failed"));
        }

}}

  gas =analogRead(gasPin);
  dtostrf(gas, 4, 2,gass) ;
  Serial.println(gas);
  delay(1000); // Print value every 1 sec.

    val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
      delay(150);
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
      digitalWrite(ledPin, LOW); // turn LED OFF

      delay(300);    
      if (pirState == HIGH){
      // we have just turned off
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
  int ldrStatus = analogRead(ldrPin);

if (ldrStatus <=550) {

digitalWrite(led, HIGH);

Serial.println("LDR is DARK, LED is ON");

}

else {

digitalWrite(led, LOW);



}
valee = analogRead(tempPin);
float cel = (valee * 0.48828125)/2.12304; 
dtostrf(cel, 4, 2,temp) ;
Serial.print("TEMPRATURE = ");
Serial.print(cel);
Serial.print("*C");
Serial.println();
delay(1000);