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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. float implementation_1(float x)
  5. {
  6. 	return powf(x, 4) - 10 * powf(x, 3) + 35 * powf(x, 2) - 50 * x + 24;
  7. }
  8.  
  9. float implementation_2(float x)
  10. {
  11. 	return (x - 1) * (x - 2) * (x - 3) * (x - 4);
  12. }
  13.  
  14. float implementation_3(float x)
  15. {
  16. 	return x * (x * ((x - 10) * x + 35) - 50) + 24;
  17. }
  18.  
  19. int main()
  20. {
  21. 	float x = 3.14159263f;
  22. 	printf ("Implementation 1: %a\n", implementation_1(x));
  23. 	printf ("Implementation 2: %a\n", implementation_2(x));
  24. 	printf ("Implementation 3: %a\n", implementation_3(x));
  25.  
  26. 	printf("Does implementation 1 match 2? %d\n", implementation_1(x) == implementation_2(x));
  27. 	printf("Does implementation 1 match 3? %d\n", implementation_1(x) == implementation_3(x));
  28. 	printf("Does implementation 2 match 3? %d\n", implementation_2(x) == implementation_3(x));
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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Implementation 1: -0x1.30482bc9354p-2
Implementation 2: -0x1.30494cp-2
Implementation 3: -0x1.3049p-2
Does implementation 1 match 2? 0
Does implementation 1 match 3? 0
Does implementation 2 match 3? 0
https://ideone.com/KJhkeA
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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