Control Structures and what variable types work

Projects Programming
1

Hello I have looked and search the web and several forums but I have not found a place that says what variable types work in control structures. I am trying to use an if statement with a double type variable and it wont execute. I changed the variable to an int type and it worked fine. Do control structures only work with int type variables? I am trying to run a variable over all the possible variations and find the one that best fits what I need. The 'a' variable is the one that was a double and now I have made an int by changing it from a decimal to an integer. I just want to know.

void loop()
  { 
    count = count + 1;
    if (count == 100)
    {
      count = 0;
      a = a + 1;
      Serial.println("");
      Serial.println("");
    }
    if (count == 99)
    {
      if (a == 99)
      {
        Serial.end();
      }
    }
2

any primitive type is usable. floats are equivalent to double on the arduino ( no double precision ).

However a float set to 100.00 may not equal an int set to 100 ( a literal number is an integer by default ),

maybe try comparing like terms:

double d = 100.0f;

if( d == 100.0f ){  //f is float literal specifier.
  //...
}
3

Thank you. For some reason if you set a variable as a double type it will not look at it but if you set it as a float type it works just fine. Thanks again.

4

No worries, I'll have to have a look into that later, I always assumed a float would be interchangeable with double ( on the Arduino ).

5

For some reason if you set a variable as a double type it will not look at it

What is "it" that won't look at "it"?

Post your complete code. Doubles work just fine. If you are having problems, it is your code or your expectations.