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  1. #include <stdio.h>
  2. #include <float.h>
  3. #include <math.h>
  4.  
  5. int main(void) {
  6. 	double a, b, c;
  7.  
  8. 	while (scanf("%lf%lf%lf", &a, &b, &c)==3)
  9. 	{
  10. 		if (a==0) {
  11. 			if (b!=0)
  12. 				printf("%lg\n", -c/b);
  13. 			else
  14. 				printf("-");
  15. 			continue;
  16. 		}
  17. 		double delta = b * b - 4 * a * c;
  18. 		if (fabs(delta)<DBL_EPSILON * (2*fabs(b)+4*fabs(a)+4*fabs(c))) {
  19. 			printf("%lg\n", -0.5*b/a);
  20. 		} else if (delta>0) {
  21. 			double dx = 0.5*sqrt(delta)/a;
  22. 			double center = -0.5*b/a;
  23. 			printf("%lg\t%lg\n", center-dx, center+dx);
  24. 		} else {
  25. 			double im = 0.5*sqrt(-delta)/a;
  26. 			double re = -0.5*b/a;
  27. 			printf("%lg%+lgi\t%lg%+lgi\n", re, im, re, -im);
  28. 		}
  29. 	}
  30. 	return 0;
  31. }
  32.  
Success #stdin #stdout 0s 2160KB
comments (?)
stdin
copy 
1 0 1
1 0 -1
1 -5 4
2 10 8
0.2 -0.12 0.018
stdout
copy 
-0+1i	-0-1i
-1	1
1	4
-4	-1
0.3
https://ideone.com/6woJ9b
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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