/* 24/07/2021
   mathmaticsv4

   Division
   Understand the issues with division of integers.
   learn how to use a float.
   Arduinos do NOT like floats, they use a lot of processor time compared to whole numbers.

*/

int q;
int w;
int myAnswer;
float myFloat;

void setup() {
  // Serial.begin(9600) starts serial communication. 9600bps bits per second = 1200 characters per second
  Serial.begin(9600);
  //Send script name
  Serial.println("mathematicsv4...");
  //this will print a blank line
  Serial.println(" ");

}

void loop() {
  if (q < 1) {
    //Example 1
    //add 1 to the value of q so the if statement will fail next time round
    q++;
    Serial.print("q = ");
    Serial.println(q);
    //Simple addition
    Serial.println("Simple division");
    for (w = 0; w < 10; w++) {
      // the symbol for division is /
      myAnswer =  w / q;
      Serial.print(" w =");
      Serial.print(w);
      Serial.print(" myAnswer =");
      Serial.println(myAnswer);
    }
    //Example 2
    //change the value of q to 10
    q = 10;
    //Notice that an integer cannot have a decimal point
    Serial.println("Simple division...all the results are rounded down.");
    Serial.print("q = ");
    Serial.println(q);
    for (w = 0; w < 31; w++) {
      myAnswer =  w / q;
      Serial.print(" w =");
      Serial.print(w);
      Serial.print(" myAnswer =");
      Serial.println(myAnswer);
    }
    //Example 3
    //change the value of q to 10
    q = 10;
    //Notice that an integer cannot have a decimal point

    //helps with the issue of dividing and then multiplying
    Serial.println("Simple division...multiplying by 100 to use a whole number.");
    Serial.print("q = ");
    Serial.println(q);
    for (w = 0; w < 31; w++) {
      myAnswer =  w * 100 / q;
      Serial.print(" w =");
      Serial.print(w);
      Serial.print(" myAnswer =");
      Serial.println(myAnswer);
    }
    //Example 4
    //change the value of q to 10
    q = 10;
    //Using a float to get a decimal point
    Serial.println("Simple division...Using a float");
    Serial.print("q = ");
    Serial.println(q);
    for (w = 0; w < 31; w++) {
      //because the division is between two integers there is no decimal value even when we save the result as a float.
      myFloat =  w / q;
      Serial.print(" w =");
      Serial.print(w);
      Serial.print(" myFloat =");
      Serial.println(myFloat);
    }
    //Example 4
    q = 10;
    //Using a flat to get a decimal point
    Serial.println("Simple division...Using a float");
    Serial.print("q = ");
    Serial.println(q);
    for (w = 0; w < 31; w++) {
      myFloat =  float(w) / float(q);
      Serial.print(" w =");
      Serial.print(w);
      Serial.print(" myFloat =");
      //Only prints to 2 decimal places by default
      Serial.print(myFloat);
      Serial.print(" myFloat to 4 decimal points =" );
      Serial.println(myFloat,4);
    }

  }

}