"Expressions in statements must only be executed for their side-effects."

Unity Engine
1

I’ve searched through the forums and couldn’t find anything helped me on this one. I’m sure it’s simple enough, but it’s driving me crazy.

function PercentageMultiplier(multiplier : float){
	for(var i = 0; i<10; i++){
	multiplier + .01;
	yield WaitForSeconds(1);
	}
}

I’m getting an error on the 3rd line reading: Expressions in statements must only be executed for their side-effects. The variable exists, and if I comment that line out, it’s fine. I’ve seen people have the same error, but it seems they’ve always just set up their for loop up wrong. Any ideas?

2

“May only be executed for their side-effects” The operation that you want to perform will not actually do anything unless you assign it to something.

var num = multiplier + .01;
3

multiplier is a variable already. I’m trying to increase it in this loop. I’ve even tried inserting a different var. Example below:

function PercentageMultiplier(multiplier : float){
	for(var i = 0; i<10; i++){
	speedMultiplier + .01;
	yield WaitForSeconds(1);
	}
}

speedMulitplier is declared outside of this and I get the same result.

4

Yup, if you want to increase it then you need to set it equal to the result(side-effect) of the equation.

speedMultiplier = speedMultiplier + .01;
5

duuurrrr THANK YOU!

6

Using the += operator would also do it.

multiplier += .01;
7

var leftWheel : WheelCollider;
var rightWheel : WheelCollider;
var maxTorque= 260.0;

function Start () {

‘GetComponent y = 0’;
}

function FixedUpdate () {
leftWheel.motorTorque = maxTorque * Input.GetAxis(“Vertical”);
rightWheel.motorTorque = maxTorque * Input.GetAxis(“Vertical”);

leftWheel.steerAngle = 10 * Input.GetAxis(“Horizontal”);
rightWheel.steerAngle = 10 * Input.GetAxis(“Horizontal”);

}

I’ve the same problem. Can somebody help me?