thyristor rectifier design to controll speed of dc motor

Code C - [expand]
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int inter=0;
int inter1=1;
double val;
double time;
double time1;
int a=0,b=0,angle;
void setup()
{
  noInterrupts();
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
 
  interrupts();
  attachInterrupt(inter,stateChange,RISING);
  attachInterrupt(inter1,stateChange1,FALLING);
 Serial.begin(9600);
}
 
void loop()
{
   val = analogRead(A0);
  angle=map(val, 0, 1023, 0, 180);
  Serial.println(angle);
  if (a==1)
  {val = analogRead(A0);
  val = map(val, 0, 1023, 0, 9);
  time=9-val;
  time1=val;
    digitalWrite(9,LOW);
   delay(time1);
   digitalWrite(9,HIGH);
   delay(time);
   digitalWrite(9,LOW);
   a=0;
  }
 
  if(b==1)
  {val = analogRead(A0);
  val = map(val, 0, 1023, 0, 9);
  time=9-val;
  time1=val;
    digitalWrite(10,LOW);
   delay(time1);
   digitalWrite(10,HIGH);
   delay(time);
   digitalWrite(10,LOW);
   b=0;
  }
}
 
 void stateChange()
 {
   a=1;
 }
 
   void stateChange1()
 {
   b=1;
 }