I want to use the following expression
-(void)SwitchCondn{
int expression;
int match1=0;
int match2=1;
switch (expression)
{
case match1:
//statements
break;
case match2:
//statements
break;
default:
// statements
break;
}
But I got
When I research I found
In order to work in Objective-C, you should define your constant either like this:
#define TXT_NAME 1
Or even better, like this:
enum {TXT_NAME = 1};
I have been using this methods since long time . Now my variable value will change in run time so I need to define in others way and i didn't want to use if else so is there any way of declaration variable others way
I have had study following
Why can I not use my constant in the switch - case statement in Objective-C ? [error = Expression is not an integer constant expression]
Objective C switch statements and named integer constants
Objective C global constants with case/switch
integer constant does 'not reduce to an integer'
The error expression is not an integer constant expression
means just what it says: in a case
, the value must be constant, as in, not a variable.
You could change the declarations above the switch
to be constants:
const int match1=0;
const int match2=1;
Or you could use an enumeration. Or a #define
. But you can't use non-constant variables there.
If you want to have labeled cases, you need a ENUM type
typedef NS_ENUM(int, MyEnum) {
match1 = 0,
match2 = 1
};
- (void)switchCondn:(MyEnum)expression {
switch (expression)
{
case match1:
//statements
break;
case match2:
//statements
break;
default:
// statements
break;
}
}
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