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int stp =8,dir=9;
int prev=0;
// analog read angle
int val;
void setup()
{               
  pinMode(stp, OUTPUT);
  pinMode(dir, OUTPUT);   
 
  ///temp to read various angles 
  Serial.begin(9600);  
}
 
void run(int angle){
  double steps =(double) angle /1.8;
  double a=0;
  while(a<steps){
    a=a+1.8;
    digitalWrite(stp, HIGH);   
    delay(20);               
    digitalWrite(stp, LOW); 
    delay(20);  
 
  }
}
void changeDirection(){
  digitalWrite(dir, HIGH);
}
void changeDirection2(){
  digitalWrite(dir, LOW);
}
void loop()
{
  if(Serial.available() > 0)
  {
    String str = Serial.readStringUntil('\n');
    val = str.toInt();
    Serial.println(val);
    val = val - prev;
    int temp_prev = prev;
    prev= prev+val;
 
    if(val<0){
      changeDirection();
      val=val*-1;
 
      run(val);
      changeDirection2();
 
    }
    else run(val);
 
    if(prev>180){
      prev=prev-temp_prev;
    }
  }
}
 

Main.java:1: error: class, interface, or enum expected
int stp =8,dir=9;
^
Main.java:1: error: class, interface, or enum expected
int stp =8,dir=9;
    ^
Main.java:2: error: class, interface, or enum expected
int prev=0;
^
Main.java:4: error: class, interface, or enum expected
int val;
^
Main.java:5: error: class, interface, or enum expected
void setup()
^
Main.java:8: error: class, interface, or enum expected
  pinMode(dir, OUTPUT);   
  ^
Main.java:11: error: class, interface, or enum expected
  Serial.begin(9600);  
  ^
Main.java:12: error: class, interface, or enum expected
}
^
Main.java:16: error: class, interface, or enum expected
  double a=0;
  ^
Main.java:17: error: class, interface, or enum expected
  while(a<steps){
  ^
Main.java:19: error: class, interface, or enum expected
    digitalWrite(stp, HIGH);   
    ^
Main.java:20: error: class, interface, or enum expected
    delay(20);               
    ^
Main.java:21: error: class, interface, or enum expected
    digitalWrite(stp, LOW); 
    ^
Main.java:22: error: class, interface, or enum expected
    delay(20);  
    ^
Main.java:24: error: class, interface, or enum expected
  }
  ^
Main.java:28: error: class, interface, or enum expected
}
^
Main.java:31: error: class, interface, or enum expected
}
^
Main.java:37: error: class, interface, or enum expected
    val = str.toInt();
    ^
Main.java:38: error: class, interface, or enum expected
    Serial.println(val);
    ^
Main.java:39: error: class, interface, or enum expected
    val = val - prev;
    ^
Main.java:40: error: class, interface, or enum expected
    int temp_prev = prev;
    ^
Main.java:41: error: class, interface, or enum expected
    prev= prev+val;
    ^
Main.java:43: error: class, interface, or enum expected
    if(val<0){
    ^
Main.java:45: error: class, interface, or enum expected
      val=val*-1;
      ^
Main.java:47: error: class, interface, or enum expected
      run(val);
      ^
Main.java:48: error: class, interface, or enum expected
      changeDirection2();
      ^
Main.java:50: error: class, interface, or enum expected
    }
    ^
Main.java:53: error: class, interface, or enum expected
    if(prev>180){
    ^
Main.java:55: error: class, interface, or enum expected
    }
    ^
29 errors

Standard output is empty