Selection Issues with xCode

fun.bobby1981

I'm beginning to learn Objective C & am using xCode to build basic learner applications
I've started with a basic calc app that has a button "ADD" and two hard coded numbers; 2 & 3.

When I click the button, the result (stored as float) is output to a label correctly, as 5.00000.

However, when I introduce an if statement (to allow for additional buttons) which performs different arithmetic depending on the ID of the sender, the math goes out the window.

With no addition to the above, except for putting it in an IF statement, the result of the calculation is displayed as -1.998977. I've outlined the implementation code below.

Can anyone suggest what I might be missing??

int num_1 = 3;
int num_2 = 2;
float result_Num;

if (sender == addition)
result_Num = num_1 + num_2;

NSString *resultString = [[NSString alloc] initWithFormat:
@%f, result_Num];

result_Text.text = resultString;
[resultString release];

(note that all relevant objects are synthesised & release appropriately (at least according to instructions that I have read!!) :-)

Genghiz Cohen

I could be that the IF never hits and skips over the init of result_Num.
So you never actually init result_Num and it outputs garbage.
Slap a breakpoint on the line "result_Num = num_1 + num_2;" and see if it hits.
Also, init all variables to something, even 0.