Need help with function parameters Iphone SDK

I'm really newbie developing iphone apps, and I got a question...

I would like to know how must I do to receive the var that my function returns.

Take a look:

-(void)myfunc{
     float num1 = 2.50;
     float num2 = 3.50;

     //here is my doubt, how can I get the value that function returns?
     float 开发者_如何学编程varreceived = [self getNumber:num1:num2];
}

//the function that receive the vars and returns a value 

-(float)getNumber: (float)var1 :(float)var2 {

        NSLog(@"1->%f",var1);
        NSLog(@"2->%f",var2);

        return 3.23;
} 

I receive this error when I build:

"error: void value not ignored as it ought to be"

in this line:

float varreceived = [self getNumber:num1:num2];

Update:

Nop, I receive this error when I build:

"error: void value not ignored as it ought to be"

in this line:

float varreceived = [self getNumber:num1:num2];  

Max:

then you probably declared the -(float)getNumber: (float)var1 :(float)var2 as -(void)getNumber: (float)var1 :(float)var2 in your header

HispaJavi:

Yeah!! this is the problem, I wrote "-(void)getNumber" in header! I changed it "-(float)getNumber" and it works!! thanks!!

Everything is OK. You'll receive 3.23