LED and Switch Compolation Error Arduino 101
I notice that your pinMode function calls are not quite correct:

pinMode(Sender = OUTPUT); // Setting pin two to output 
pinMode(Reader = INPUT); // Making pin 12 set to read switch data


Should be:

pinMode(Sender, OUTPUT); // Setting pin two to output 
pinMode(Reader, INPUT); // Making pin 12 set to read switch data


Refer to https://www.arduino.cc/en/Reference/PinMode for more information.

And the whole section where you configure your I/O should be wrapped inside the setup() function.

//configuring I/O
void setup()
{
    pinMode(Sender, OUTPUT); // Setting pin two to output 
    pinMode(Reader, INPUT); // Making pin 12 set to read switch data
    digitalWrite(Sender, HIGH); //Making pin two hot
}