Linker command failed when declaring int variable

Question

When i declare a global variable, I get the error:

linker command failed with exit code 1 (use -v to see invocation)

Here is the code:

import "menuplay.h"

import "buttonmanager.h"

int  test; //<--------------when i  declare  it show  error Apple Mach-O Linker Error

@interface lessonone : CCLayer {
...
}

Do not use global variables in objective C : -

Guru
– Guru

2013-03-16 16:27:13 +00:00
Commented Mar 16, 2013 at 16:27 — Guru
– Guru, Commented Mar 16, 2013 at 16:27

CodeSmile · Accepted Answer · 2013-03-16 16:02:24Z

1

Declare it static:

static int test;

Or const if its value should never change:

const int test = 10;

answered Mar 16, 2013 at 16:02

CodeSmile

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3 Comments

Tanakorn.K Over a year ago

static int test; Can change value in other method ? This it no error but i define value in menu.mm test=10 when i show test in menuplay.mm value =0,why not =10?

CodeSmile Over a year ago

because it's a different variable. In menuplay.mm you will have to declare it as: extern int test;

Tanakorn.K Over a year ago

stackoverflow.com/questions/8808159/… All you need is to use plain old C global variables. First, define a variable in your main.m, before your main function: #import <...> // Your global variable definition. type variable; int main() { ... Second, you need to let other source files know about it. You need to declare it in some .h file and import that file in all .m files you need your variable in: // .h file // Declaration of your variable. extern type variable;

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