Using 2 buttons simultaneously to make a 3rd action

hello,
i've been trying google answer question think lack knowledge phrase properly.

i have rgb led shine red when 1 button pressed, green when button pressed , blue when both buttons pressed. tried messing creating buttonstate had 2 separate buttons in , doesn't seem answer. when verifying code error forces me add ";" in between digitalreads presume means buttonstate ignores second digitalread.

code: [select]


// constants won't change. they're used here set pin numbers:
const int buttonpin1 = 2;// number of pushbutton pin
const int buttonpin2 = 3;
const int buttonpin3 = 4;
const int ledpin1 =  10;      // number of led pin
const int ledpin2 =  11;
const int ledpin3 =  12;

// variables change:
int buttonstate1 = 0;         // variable reading pushbutton status
int buttonstate2 = 0;
int buttonstate3 = 0;
int buttonstate4 = 0;

void setup() {
  // put setup code here, run once:
// initialize led pin output:
  pinmode(ledpin1, output);
  pinmode(ledpin2, output);
  pinmode(ledpin3, output);
  // initialize pushbutton pin input:
  pinmode(buttonpin1, input);
  pinmode(buttonpin2, input);
  pinmode(buttonpin3, input);
}

void loop() {
  // put main code here, run repeatedly:
// read state of pushbutton value:
  buttonstate1 = digitalread(buttonpin1);
  buttonstate2 = digitalread(buttonpin2);
  buttonstate3 = digitalread(buttonpin3);
  buttonstate4 = digitalread(buttonpin2);digitalread(buttonpin3);

  // check if pushbutton pressed. if is, buttonstate high:
  if (buttonstate1 == high) {
    // turn led1 on:
    digitalwrite(ledpin1, high);
    digitalwrite(ledpin2, high);
    digitalwrite(ledpin3, high);
  } else {
    // turn led1 off:
    digitalwrite(ledpin1, low);
    digitalwrite(ledpin2, low);
    digitalwrite(ledpin3, low);
  }
    if (buttonstate2 == high) {
    // turn led2 on:
    digitalwrite(ledpin2, high);
  } else {
    // turn led2 off:
    digitalwrite(ledpin2, low);
  }
    if (buttonstate3 == high) {
    // turn led3 on:
    digitalwrite(ledpin3, high);
  } else {
    // turn led3 off:
    digitalwrite(ledpin3, low);
}
if (buttonstate4 == high) {
    // turn led3 on:
    digitalwrite(ledpin1, high);
  } else {
    // turn led3 off:
    digitalwrite(ledpin1, low);
}
}

in code there third button firing 3 leds simultaneously , working expected.

sorry if incredibly obvious, said, lack knowledge of terms necessary hunt down answer.

thanks

code: [select]

  buttonstate4 = digitalread(buttonpin2);digitalread(buttonpin3);


what supposed do?

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