Switch case 

const int BLED=9; //Blue LED on Pin 9
const int GLED=10; //Green LED on Pin 10
const int RLED=11; //Red LED on Pin 11
const int BUTTON=2; //The Button is connected to pin 2
boolean lastButton = LOW; //Last Button State
boolean currentButton = LOW; //Current Button State
int ledMode = 0; //Cycle between LED states
void setup()
{
 pinMode (BLED, OUTPUT); //Set Blue LED as Output
 pinMode (GLED, OUTPUT); //Set Green LED as Output
 pinMode (RLED, OUTPUT); //Set Red LED as Output
 pinMode (BUTTON, INPUT); //Set button as input (not required)
}
/*
* Debouncing Function Pass it the previous button state,
* and get back the current debounced button state.
*/
boolean debounce(boolean last)
{
 boolean current = digitalRead(BUTTON); //Read the button state
 if (last != current) //if it's different...
 {
 delay(5); //wait 5ms
 current = digitalRead(BUTTON); //read it again
 }
 return current; //return the current value
}
/*
* LED Mode Selection Pass a number for the LED state and set it accordingly.
*/
void setMode(int no)
{ switch(no)
 {case 1: //RED
 digitalWrite(RLED, HIGH);
 digitalWrite(GLED, LOW);
 digitalWrite(BLED, LOW);
break;
 case 2:  //GREEN
 digitalWrite(RLED, LOW);
 digitalWrite(GLED, HIGH);
 digitalWrite(BLED, LOW);
break;
case 3: //blue
 digitalWrite(RLED, LOW);
 digitalWrite(GLED, LOW);
 digitalWrite(BLED, HIGH);
break;
 case 4: //PURPLE (RED+BLUE)
 analogWrite(RLED, 255);
 analogWrite(GLED, 0);
 analogWrite(BLED, 255);
break;
case 5: //TEAL (light greeen)
 analogWrite(RLED, 127);
 analogWrite(GLED, 127);
 analogWrite(BLED, 0);
break;
case 6:  //ORANGe (RED+BLUE)
 analogWrite(RLED, 255);
 analogWrite(GLED, 50);
 analogWrite(BLED, LOW);
break;
case 7:  //WHITE
 analogWrite(RLED, 255);
 analogWrite(GLED, 255);
 analogWrite(BLED, 127);
break;
 //OFF (no = 0)
default:  //OFF (mode = 0)
 digitalWrite(RLED, LOW);
 digitalWrite(GLED, LOW);
 digitalWrite(BLED, LOW);
 break;
 }}
void loop()
{
 currentButton = debounce(lastButton); //read debounced state
 if (lastButton == LOW && currentButton == HIGH) //if it was pressed...
 {
 ledMode++; //increment the LED value
 }
 lastButton = currentButton; //reset button value
 //if you've cycled through the different options,
 //reset the counter to 0
 if (ledMode == 8) ledMode = 0;
 setMode(ledMode); //change the LED state
}

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