void setup() {
Serial.begin(9600);

}

void swapRef( int & value1 , int & value2) {
 int temp;
 temp=value1;
 value1=value2;
 value2=temp;
}
void loop(){
int x=random(10);
int y=random(10);
Serial.print(" the value of x and y before are swapping :");
Serial.print(x); Serial.print(","); Serial.println(y);

Serial.print(" the value of x and y  after are swapping :");
Serial.print(x); Serial.print(","); Serial.println(y); Serial.println();
delay(1000);
}