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#import <objc/objc.h>
#import <objc/Object.h>
#import <Foundation/Foundation.h>
 
@interface TestObj : NSObject
@end
 
@implementation TestObj
int main()
{
	// your code goes here
	NSMutableArray *array = [[NSMutableArray alloc] init];
	[array addObject:[NSDate date]];
	NSLog(@"%d", array.count);
 
	int main(int argc, const char * argv[]) {
    int a;
    while (YES) {
        scanf("%d", &a);
        if (a == 42) break;
        printf("%d\n", a);
    }
    return 0;
} 
@end

prog.m: In function ‘main’:
prog.m:16:6: warning: ‘main’ is normally a non-static function [-Wmain]
  int main(int argc, const char * argv[]) {
      ^~~~
prog.m:25:1: error: expected expression before ‘end’
 @end
 ^
prog.m:25:1: error: expected declaration or statement at end of input
prog.m: At top level:
prog.m:25:1: warning: ‘@end’ missing in implementation context
prog.m: In function ‘main’:
prog.m:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 @end
 ^
At top level:
prog.m:16:6: warning: ‘main’ defined but not used [-Wunused-function]
  int main(int argc, const char * argv[]) {
      ^~~~

Standard output is empty