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arduinobitwise-operators

Using & operator in if statements

#include <IRremote.h>

const int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup(){
Serial.begin(9600);
irrecv.enableIRIn();
irrecv.blink13(true);
}

 void loop(){
if (irrecv.decode(&results)){
    Serial.println(results.value, HEX);
    irrecv.resume();
}
}

What will if check here and please explain the working also.how if is working?.

Solution

  • Since the & operator is used for the address of that variable. Using it in if statement will always be true as the address will not be 0.

    Therefore your Do_somthing() function will always be called.

    Edit:

    In the edited code & operator is used to pass the address of that variable in the function irrecv.decode().

    irrecv.decode(&results)

    The above function will return true if a code was received, or false if nothing received yet. When a code is received, information is stored into "results".

    For more info: https://www.pjrc.com/teensy/td_libs_IRremote.html