Motor and sensor

Projects General Guidance
30 
for (int i = 0; i = 0; i++) // we turn the motor 
   {
   analogWrite(3, i);
   delay(10);
    for (int i = 0; i = 50; i++)
     {
      analogWrite(3, i);
      delay(10);
     }
    
   }
 buttonState = digitalRead(buttonPin);// reading of the sensor
 for (int i = 0; i = 50; i++); // here is the line that i modified
     {
      analogWrite(3, i);
      delay(10);
      buttonState = HIGH;
      if (buttonState == HIGH) //si quelquechose est detecte
   		{
    	digitalWrite(ledPin, HIGH); //on allume la LED
    	for (int i = 0; i = 0; i++) // we turn the motor 
   		{
   		analogWrite(3, i);
   		delay(10);
        }
        }
      }
}

But i already see this line but i tried to make something like the' if 'that are in you're code:

if (motorMoving == false) {
      analogWrite(motorPin, pwmValue);
      motorMoving = true;
   }
   if (motorMoving == true) {
      sensorVal = digitalRead(sensorPin);
      if (sensorVal == HIGH) {
         analogWrite(motorPin, 0);
         motorMoving = false;
      }
   }
}

But it make error because i think the:

for (int i = 0; i <= 50; i++)

doesn't work with the 'if'

But i need the 'if' to try to make my code similar of yours...