Automation basics using arduino and DTMF decoder

int x,y,z,t;

int a=3;

int b=4;

int c=5;

int d=6;

int e=7;

int f=8;

int g=9;

int h=10;

void setup() {



pinMode(a,INPUT);

pinMode(b,INPUT);

pinMode(c,INPUT);

pinMode(d,INPUT);

pinMode(e, OUTPUT);

pinMode(f,OUTPUT);

pinMode(g,OUTPUT);

pinMode(h,OUTPUT);

Serial.begin (9600);

}

void loop() {



x=digitalRead(a);

y=digitalRead(b);

z=digitalRead(c);

t=digitalRead(d);

Serial.print(x);

Serial.print(y);

Serial.print(z);

Serial.println(t);

delay(1000);

if (x==1 && y==0 && z==1 && t==1)

{digitalWrite(e,HIGH);

digitalWrite(f,LOW);

digitalWrite(g,HIGH);

digitalWrite(h,LOW);}

if (x==1 && y==1 && z==1 && t==0)

{digitalWrite(e,LOW);

digitalWrite(f,HIGH);

digitalWrite(g,LOW);

digitalWrite(h,HIGH);}

if (x==1 && y==1 && z==0 && t==1)

{digitalWrite(e,LOW);

digitalWrite(f,LOW);

digitalWrite(g,HIGH);

digitalWrite(h,LOW);}

if (x==1 && y==0 && z==0 && t==1)

{digitalWrite(e,HIGH);

digitalWrite(f,LOW);

digitalWrite(g,LOW);

digitalWrite(h,LOW);}

if (x==0 && y==0 && z==1 && t==1)

{digitalWrite(e,LOW);

digitalWrite(f,LOW);

digitalWrite(g,LOW);

digitalWrite(h,LOW);}}