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  1. #include <stdio.h>
  2.  
  3. double f(double x)
  4. {
  5. 	return 4.0 / (1.0 + x * x);
  6. }
  7.  
  8. int main()
  9. {
  10. 	int k, n, i;
  11. 	double d, x, h, S;
  12.  
  13. 	for (k = 1; k <= 10; k++) {
  14. 		n = 1 << k;
  15. 		d = 0.5 * f(0.0);
  16. 		for (i = 1; i < n; i++) {
  17. 			x = (double)i / n;
  18. 			d += f(x);
  19. 		}
  20. 		d += 0.5 * f(1.0);
  21. 		h = 1.0 / n;
  22. 		S = h * d;
  23. 		printf("k=%d S=%f\n", k, S);
  24. 	}
  25. 	return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 1720KB
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stdin
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Standard input is empty
stdout
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k=1 S=3.100000
k=2 S=3.131176
k=3 S=3.138988
k=4 S=3.140942
k=5 S=3.141430
k=6 S=3.141552
k=7 S=3.141582
k=8 S=3.141590
k=9 S=3.141592
k=10 S=3.141592
https://ideone.com/hZCIz
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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