Multiple if statements comparing text and integers - c++

Question

I am trying to make multiple if statements with multiple conditions. If I run the code it works fine but it never changes the output. I always get the second statement >= 29. Here's my code.
if (label.text <= #"30")
{label.text = #"Text";}
else if (label.text >= #"29")
{label.text = #"Text";}
else if (label.text >= #"19")
{label.text = #"Text";}
else if (label.text >= #"10")
{label.text = #"Text";}
else if (label.text = #"00")
{label.text = #"Text";}
ok I have changed my code but i still doesn't work any suggestions
label.text = temporaryValue;
if ([label.text floatValue] <= 30)
{label.text = #"text1";}
else if ([label.text floatValue] >= 29)
{label.text = #"text2";}
else if ([label.text floatValue] >= 19)
{label.text = #"text3";}
else if ([label.text floatValue] >= 10)
{label.text = #"text4";}
else if ([label.text floatValue] == 0)
{label.text = #"text5";}

Answer 1

You can't compare the numerical values of a string like this; this operation performs pointer comparison, i. e. it compares the (rather random) addresses of the string instances you pass in. Use something like this:
if ([label.text floatValue] >= 30.0) {
}
etc.

Answer 2

Using >= or <= with NSString* would compare the addresses, not the content of those strings. If you want to compare like this, you should parse your string into an int and compare it using common integer comparison:
int val = [label.text intValue];
if (val > 30) {
...
}
else ... // more of your ifs

Answer 3

Once you fix your syntax (as suggested in other answers here) you will still have a problem, as once you are dealing with numeric comparisons your logic flow seems flawed. Consider this
if ([label.text floatValue] <= 30.0)
{label.text = #"Text";}
else if ([label.text floatValue] >= 29.0)
{label.text = #"Text";}
if your test value IS greater than 30, you move to the next else if
else if ([label.text floatValue] >= 29.0)
clearly this IS bigger than 29 since it failed to be less than or equal to 30. Therefore all your other conditonals are never reached as assuming your first conditional is false, the second MUST be true.