• juliebean@lemm.eeEnglish
    46·
    2 years ago

    what would be the alternative? to always execute if the condition is true, but sometimes execute it even when false, for funsies?

    • General_Effort@lemmy.worldEnglish
      5·
      2 years ago

      In normal parlance, “if and only if” rules out that something could also happen as a result of other circumstances. EG, if you fall out of a plane, you will lose your glasses. But there are other conditions that would lead to the same result.

      In code, the alternative would be to have a different if statement that executes identical code. Or *cough* you could use a jump instruction to execute literally the same code.

    • unmagical@lemmy.mlEnglish
      1·
      2 years ago

      Brb, making a truly “if” statement function in my products code base for funsies.

  • dohpaz42@lemmy.worldEnglish
    41·
    2 years ago

    An if statement with one condition is an if and only if statement. The moment you add a second (or more) condition (regardless of && or ||), then it’s no longer if and only if.

  • Steve Dice@sh.itjust.worksEnglish
    85·
    2 years ago

    No, they’re not.

    Let’s assume they are. Let funky function be defined as:

    int funky() {
    a=0
    b=1
    if ( a==1 ) {
        b=1
    }
    return(a)
}

    Since a==1 if, and only if, b=1, in particular a==1 if b=1. We have b=1, therefore a==1. It follows funky will always return 1 but… it doesn’t. QED.