Question:
I have :
NSInteger dollarrow = [ValuesPicker selectedRowInComponent:kDollar]; NSString *dollar = [dollarlist objectAtIndex:dollarrow]; double converteddollar=0; I want to do a for loop on this and get the value in double , I am trying this :
for(dollar=1;dollar<=99;dollar++) { converteddollar = converteddollar + 2; } Now the dollar contains NSString how do I convert into double to do the operation successfully and then
NSString *message = [[NSString alloc] initWithFormat:@"%0.2f",converteddollar]; I am getting warnings and the app is crashing .. How can I correct it . I am learning Objective C please help . Thankyou . Sorry I did not want == i just wanted to use =
Solution:1
Your for loop is wrong. Are you really want '=='? I guess you want only '='. Can't you use something like this? (I'm just giving an example to point the mistakes in loop. Your requirement may be something different. And also I have not compiled the code, don't have mac with me right now. So you may get some minor mistake)
double sum = 0 for (NSInteger i = 1; i <= 99; i++) { sum += 2; // or whatever you need here } NSString *convertedStr = [NSString stringWithFormat:@"%lf", sum];
Solution:2
Lots of errors...
NSInteger dollarrow = [ValuesPicker selectedRowInComponent:kDollar]; The selectedRowInComponent: method is a member method. Not a static one. You need to call it on an instance.
== is a comparison operator. What you want is certainly an assignment, with a single =sign.
You declare a pointer to a NSString object. But it's not initialized.
You should also use a temporary double variable for your loop.
I don't understand what your loop is supposed to do. Can you explain a little bit?
Solution:3
NSString *dollar = [dollarlist objectAtIndex:dollarrow];
double converteddollar = [dollar doubleValue]; should work (no need for you for loop)
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