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  1. #import <objc/objc.h>
  2. #import <objc/Object.h>
  3. #import <Foundation/Foundation.h> 
  4.     #import <UIKit/UIKit.h>
  5. @implementation TestObj
  6. - (NSString *)hexStringFromColor:(UIColor *)color {
  7.     const CGFloat *components = CGColorGetComponents(color.CGColor);
  8.  
  9.     CGFloat r = components[0];
  10.     CGFloat g = components[1];
  11.     CGFloat b = components[2];
  12.  
  13.     return [NSString stringWithFormat:@"#%02lX%02lX%02lX",
  14.             lroundf(r * 255),
  15.             lroundf(g * 255),
  16.             lroundf(b * 255)];
  17. }
  18. int main()
  19. {
  20. 	// your code goes here
  21. 	return 0;
  22. }
  23. @end
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.m:4:13: fatal error: 'UIKit/UIKit.h' file not found
    #import <UIKit/UIKit.h>
            ^~~~~~~~~~~~~~~
1 error generated.
stdout
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Standard output is empty
https://ideone.com/ibZAUy
language:
Objective-C (clang 8.0)
created:
4 years ago
visibility:
public

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