move servo with one push button

hi all
i don't know do
i move servo motor 1 push button
in beginning  move x degree  after each push button pressed   to 160°after servo come same prossecus  each pb pressed servo come x°  x° reach  initial position 0°
someone me, please ?
thx helping
#include <servo.h>

// constant variables used set servo angles, in degrees
const int straight = 0;
const int divergent = 160;

// constant variables holding ids of pins using
const int buttonpin = 2;
const int servopin = 9;

// servo movement step delay, in milliseconds
const int step_delay = 70;

// create servo object
servo myservo; 
 
// global variables store servo position
int pos = straight; // current
int old_pos = pos; // previous

void setup()
{
  // set mode digital pins in use
  pinmode(buttonpin, input);
   
  // setup servo
  myservo.attach(servopin);  // attach servo on pin 9
  myservo.write(pos); // set initial servo position
}

void loop()
{
 // start each iteration of loop reading button
 // if button pressed (reads high), move servo
  int button_state = digitalread(buttonpin);
  if(button_state == high){
   
    old_pos = pos;   // save current position
   
    // toggle position opposite value
    pos = pos == straight ? divergent: straight;
       
    // move servo new position
    if(old_pos < pos){   // if new angle higher
      // increment servo position oldpos pos
      for(int = old_pos + 1; <= pos; i++){ 
        myservo.write(i); // write next position servo
        delay(step_delay); // wait
      }
    } else {  // otherwise new angle equal or lower
      // decrement servo position oldpos pos
      for(int = old_pos - 1; >= pos; i--){
        myservo.write(i); // write next position servo
        delay(step_delay); // wait
      }
    }
   
  }
}// end of loop

ok result

#include <servo.h>

// constant variables used set servo angles, in degrees
const int degre = 3.1; // on bouge de 5° en 5°
// constant variables holding ids of pins using
const int buttonpin = 2;
const int servopin = 9;

// servo movement step delay, in milliseconds
const int angle_min = 0;
const int angle_max = 20;
const int step_delay = 500;

// create servo object
servo myservo; 
 
// global variables store servo position
int pos = angle_min; // current
bool vers_max = true;

void setup()
{
  // set mode digital pins in use
  pinmode(buttonpin, input_pullup);
   
  // setup servo
  myservo.attach(servopin);  // attach servo on pin 9
  myservo.write(pos); // set initial servo position
}

void loop()
{
 // start each iteration of loop reading button
 // if button pressed (reads high), move servo
  int button_state = digitalread(buttonpin);
  if(button_state == high){

    if( vers_max ){
      pos += degre;
    }
    else{
      pos -= degre;
    }

    if( pos <= angle_min ){
      pos = angle_min;
      vers_max = true;
    }
    else if( pos >= angle_max ){
      pos = angle_max;
      vers_max = false;
    }

    myservo.write( pos );
    delay(step_delay); // wait
   
    /*old_pos = pos;   // save current position
   
    // toggle position opposite value
    pos = pos == straight ? divergent: straight;
       
    // move servo new position
    if(old_pos < pos){   // if new angle higher
      // increment servo position oldpos pos
      for(int = old_pos + degre; <= pos; += degre){ 
     // for(int = old_pos + 1; <= pos; i++){ 
        myservo.write(i); // write next position servo
        delay(step_delay); // wait
      }
    } else {  // otherwise new angle equal or lower
      // decrement servo position oldpos pos
      for(int = old_pos - degre; >= pos; -= degre){
      //for(int = old_pos - 1; >= pos; i--){
        myservo.write(i); // write next position servo
        delay(step_delay); // wait
      }
    }*/
  }
}// end of loop

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