Question

I am getting a dead store warning when I analyze my project but the project does not crash.
Here is what I am doing

NSString *graphUrl = nil;

if ([graphArray count] == 1)
{
    objTrial = [graphArray objectAtIndex:0];

    graphUrl = @"http://chart.apis.google.com/chart?cht=s:nda&chf=bg,s,FFFFFF&chs=";

    graphUrl = [graphUrl stringByAppendingString:@"&chd=t:"];
    graphUrl = [graphUrl stringByAppendingString:objTrial.highValue];// get the dead store error here

}
else
{
    //someother operation is done and a value is loaded to aURL
}

I get a dead store warning as mentioned in the code.. How can I prevent this?

It would be great if someone could help me out in this

Answer 1

The warning is telling you that the store that you do in the first line gets thrown away (i.e assigning an empty string to the variable and then reassigning it afterwards without using the original value). Just change the first line to the following and the warning should go away:

NSString *aUrl;

Edit:

you should change the line where you use it also:

aURL = [aValue copy];