Numeric var from a textfield

[jhoncybpr]

I've make a small project.
In this project i make a simple equations.

I don't know like declaring a numeric variable and assign to var a textField numeric value for execute the calculator.

A small sample are here:

//------ File .h

NSNumber *myNumber;

//------ File .m
- (void)viewDidLoad
{
//.. various var, ..etc.

myNumber = [[NSNumber alloc] init];
//
//myNumber = [[NSNumber alloc] initWithDouble:0];
[self myFunction]
}

-(void) myFunction{

myNumber = [NSNumber numberWithDouble:[myTextField.text doubleValue]];
float calcoloRisultato;
calc = myNumber/0.8;
// ERROR Calc.

}


----- If i make
double myNumber = [myTextField.text doubleValue];
All is OK
Where is the error?
How to solve this?

I want declare the myNumber var in all class and not only in a function.
Thanks for help me.
jj

[jshake11]

What if you do it like this?


//------ File .h

double myNumber;

//------ File .m
- (void)viewDidLoad
{
//.. various var, ..etc.


[self myFunction]
}

-(void) myFunction{

myNumber = [myTextField.text doubleValue];
double calcoloRisultato;
calcoloRisultato = myNumber/0.8;
// ERROR Calc.

}