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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double f(double x)
  5. {
  6. 	return pow(x, 3.0);
  7. }
  8.  
  9. int main()
  10. {
  11. const double ANS = 1.0 / 4.0; 
  12. double a = 0.0;
  13. int N;
  14.  
  15. 	for (N=1 ; fabs(a - ANS) >= 0.001; N++ ) {
  16. 		double x;
  17. 		double d = 1.0 / (double)N;
  18. 		for (x=0.0, a=0.0; x<=1.0; x+=d)
  19. 			a += ((d + d) * f(x)) / 2.0;
  20. 	}
  21.  
  22. 	printf("%f\n", a);
  23.  
  24. 	return 0;	
  25. }
  26.  
Success #stdin #stdout 0.03s 1720KB
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https://ideone.com/yntWm
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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