ARDUINO RC BOAT.ino

int f_button = 9;
int b_button = 8;
int l_button = 7;
int r_button = 6;
int m1=2;
int m2=3;
int m3=4;
int m4=5;

void setup () {
  pinMode(f_button,INPUT_PULLUP);
  pinMode(b_button,INPUT_PULLUP);
  pinMode(l_button,INPUT_PULLUP);
  pinMode(r_button,INPUT_PULLUP);
  pinMode(m1,OUTPUT);
  pinMode(m2,OUTPUT);
  pinMode(m3,OUTPUT);
  pinMode(m4,OUTPUT);
}

void loop() { 
 if ( digitalRead(f_button)==LOW)
 {
   digitalWrite(m1, LOW);
   digitalWrite(m3, LOW);
 }
 if ( digitalRead(b_button)==LOW)
 {
   digitalWrite(m2,LOW );
   digitalWrite(m4,LOW);
 }
  if ( digitalRead(l_button)==LOW)
 {
   digitalWrite(m1,LOW);
 }
  if ( digitalRead(r_button)==LOW)
 {
   digitalWrite(m3,LOW);
 }
 else
 {
   digitalWrite(m1,HIGH);
   digitalWrite(m2,HIGH);
   digitalWrite(m3,HIGH);
   digitalWrite(m4,HIGH);
 }
 
}