Use of undeclared identifier FLT_MAX when used in macro

Question

I use the following code to dynamically resize labels:

CGRect frame = self.myLabel2.frame;
frame.origin.y = self.myLabel1.frame.origin.y + self.myLabel1.frame.size.height + 10;
frame.size = LABEL_SIZE(self.myLabel2);
self.myLabel2.frame = frame;

Where LABEL_SIZE is a macro defined as :

#define LABEL_SIZE(label) CGSizeMake(280, [label sizeThatFits:CGSizeMake(280, FLT_MAX)].height);

The code works absolutely fine when run on simulator (32-bit). The problem arises when running on simulator (64-bit). XCode shows it not as a warning, but as an error, due to which, it will not even compile.

I do not understand, am I missing something?

FLT_MAX is a maximum value of float. use when you want to find number with comparison of max value — Sunny Shah, May 17 '14 at 07:12
I don't know if you have tried other links before posting the question, but this link has exact what you are looking for: http://stackoverflow.com/questions/6285188/is-there-a-constant-for-the-maximum-cgfloat-value — Tarun, Jan 08 '15 at 06:13
@Tarun, that question is not **remotely** related to what I had asked. Mine is a compilation error. I know `CGGeometry` defines. Anyway, I solved this issue of mine a long time back. — n00bProgrammer, Jan 08 '15 at 10:53

score 0 · Answer 1 · answered Jan 18 '21 at 22:23

0

You forgot to include float.h

#include <float.h>
float a = FLT_MAX;

answered Jan 18 '21 at 22:23

Bram

7,440
3
52
94

score -2 · Answer 2 · edited Jan 08 '15 at 07:28

-2

Try to use CGFLOAT_MAX instead of FLT_MAX as show below

#define LABEL_SIZE(label) CGSizeMake((CGFloat)280, [label sizeThatFits:CGSizeMake((CGFloat)280, (CGFLOAT_MAX))].height);

edited Jan 08 '15 at 07:28

Rustam Gasanov

15,290
8
59
72

answered Jan 08 '15 at 06:01

Sethu

71
1
3

Use of undeclared identifier FLT_MAX when used in macro

2 Answers2