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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	double p = 1.0, s = 0.0;
  5. 	for (int i = 1; i <= 262141; i += 2) {
  6. 		s += p / i;
  7. 		p = -p;
  8. 	}
  9. 	printf("%f\n", 4 * s);
  10. 	return 0;
  11. }
Success #stdin #stdout 0.01s 5308KB
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3.141600
https://ideone.com/OFVXHi
Leibniz's formula for π converges extremely slowly, and it exhibits sublinear convergence.
language:
C (gcc 8.3)
created:
9 hours ago
visibility:
public

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