Multiple Buttons on seperate digital inputs

i cannot figure out i've gone wrong. trying hook multiple buttons (each on own pin) , read results. first 2 work fine (pins 2, , 3) pin 4 doesn't seems response. so, stripped down code (see below) , set read 1 button. works other buttons, not last one.

code: [select]

const int pinbtn[] = {2,3,4};
const int pinled = 11;

int pinstate = 0;


void setup(){
  pinmode(pinled, output);
  for(int = 0; i<3; i++){
    pinmode(pinbtn[i], input);
  }
}

void loop(){
  pinstate = digitalread(pinbtn[2]);
  if(pinstate == high){
    digitalwrite(pinled, high);
  }else{
    digitalwrite(pinled, low);
  }
}


if change pinbtn[2] index in line:

code: [select]

  pinstate = digitalread(pinbtn[2]); 0 or 1 corresponding button work. have changed last pin (pin 4) multiple other pins (in case 1 fried, same result).

breadboard view:
https://docs.google.com/document/d/15t35rbkxem9c0rv81egeixqghhtkzm5hxxorcbuejly/edit?usp=sharing

try rotating button through 90 degrees.

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