Related to C programming/Arduino

The volatile keyword tells the compiler not to optimize a variable is used when a peripheral device might alter the value directly has no effect on integers can only be used on registers A pullup resistor is required when a pin is connected to a switch any time you want to read data when you want to write data to prevent a diode from exploding The loop function in Arduino code is essentially the same as what code? while(1) {...} if(true) {...} do {...}while(true) none of these options