serial.read() working

#include <stdlib.h>;

int yLED = 3;
int gLED = 4;
int rLED = 5;
char Coms[5];

void setup(){
  pinMode(yLED, OUTPUT);
  pinMode(gLED, OUTPUT);
  pinMode(rLED, OUTPUT);
  Serial.begin(9600);
}

void loop(){
  while (Serial.available() == 0);

  for(int x = 0; x < 4; x++){
    Coms[x] = Serial.read();
    Serial.print("Coms ");
    Serial.print(x);
    Serial.print(": ");
    Serial.println(Coms[x]);
  }
  Serial.println(Coms);
  delay(1000);
  int temp = atoi(Coms);
  if(temp == 0001){
    digitalWrite(yLED, HIGH);
  }
  if(temp == 0000){
    digitalWrite(yLED, LOW);
  }
}