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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. struct Pixel {
  5. 	unsigned char a, r, g, b;
  6. } ;
  7.  
  8. int main() {
  9. 	const int length = 128;
  10. 	Pixel image_data[length];
  11. 	unsigned int i;
  12. 	unsigned int p;
  13. 	float	 factor;
  14.  
  15. 	cin>>p;
  16. 	cout<<"Result="<<(unsigned int)(p * 0.5)<<endl;
  17.  
  18. 	for ( i = 0; i < length; i++ )
  19. 	{
  20. 	    if ( image_data[i].a == 0 )
  21. 	        image_data[i].r = image_data[i].g = image_data[i].b = 0;
  22. 	    else //if ( image_data[i].a < 255 ) //you don't need this check if a is 8-bit unsigned
  23. 	    {
  24. 	        image_data[i].r = (unsigned short)image_data[i].r * image_data[i].a >> 8;
  25. 	        image_data[i].g = (unsigned short)image_data[i].g * image_data[i].a >> 8;
  26. 	        image_data[i].b = (unsigned short)image_data[i].b * image_data[i].a >> 8;
  27. 	    }
  28. 	}	
  29.  
  30. 	// your code goes here
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 16064KB
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Result=2
https://ideone.com/AtraI7
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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