if statement question

Unity Engine
1

Hi,

just a quick Q , whats the difference with using curly brackets in a function and not using them?

Thanks.

if(gameC.unitCount < 2){
				carUI.SetActive(true);
				selectToMove.enabled = true;
			}

if(gameC.unitCount < 2)
				carUI.SetActive(true);
				selectToMove.enabled = true;
2

Without brackets your last code is equal to

if(gameC.unitCount < 2) {
                carUI.SetActive(true);
}
selectToMove.enabled = true;

In other words: you can just put one instruction without brackets.

3

hmm, I still don’t fully get it.

4

I’ll show you an example. Suppose we want a function that display two messages if and only if the variable “a” is bigger than 10.

void FunctionOne() {
    int a=0;
    if (a>10) {
        Debug.Log("Good news!");
        Debug.Log("A is bigger than 10!");
    }
}

void FunctionTwo() {
    int a=0;
    if (a>10) 
        Debug.Log("Good news!");
        Debug.Log("A is bigger than 10!");
}

These two functions look very similar but the second one always print “A is bigger than 10!”, also when the variable “a” is zero. The reason is that the compiler automatically puts brackets for you when you don’t put them. It puts them only around the first instruction (the “Debug.Log(“Good news!”);” one) leaving the second instruction out from the if statement.

In other words, the compiler automatically convert FunctionTwo to

void FunctionTwo() {
    int a=0;
    if (a>10) {
        Debug.Log("Good news!");
    }
    Debug.Log("A is bigger than 10!");
}

That is obviously different (in fact the second Debug.Log is always executed).

To avoid this type of bugs the rule is simple: you must always use the brackets.

5

AH cool thanks, I always use brackets, just never knew why I seen some people not use them in their coding.

But thanks cleared that up for me.

6

He whant to say: with out brackets you can put just ONE line of code! So if your IF have just one line you dont need brackets…but code look more beather with them and easy to reed :slight_smile: