ObjC: proper use of property and synthesize?

Question

Does anyone know why this code is running into compilation errors? I\'m compiling it on Catalina using clang. I posted a similar issue here but that was when I was trying to c

Answer 1

This works on my system (macOS):

#import 

@interface A: NSObject

@property int a;

@end

@implementation A {
  int a;
}
@synthesize a;

-(int) getMyValue {
return a;
}

@end

int main () {
  @autoreleasepool {
    A *a = [[A alloc] init];
   [a setA:99];
   NSLog (@"value = %d", [a getMyValue]);
 }
  return 0;
}

If file is saved as synth.m the terminal command is: clang synth.m -framework Foundation -o synth && ./synth