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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. int main() 
  5. {
  6.  
  7. 	double a,b,c,x,D,x1,x2,p,p1,p2;
  8. 	scanf("%lf %lf %lf",&a,&b,&c);
  9. 	if (a==0)//проверяем квадратное ли уравнение 
  10. 		{
  11. 			printf("Equation is not square");
  12. 		}
  13. 	else 
  14. 	{
  15. 		D=b*b-4*a*c;//дискриминант
  16. 		if(D<=0) printf("Discriminant is not positive");
  17. 		else
  18. 		{
  19. 			x1=(-b+sqrt(D))/(2*a);//первый корень
  20. 			x2=(-b-sqrt(D))/(2*a);//второй корень
  21. 			printf ("x1  %0.5lf\n",x1);
  22. 			printf ("x2  %0.5lf\n",x2);
  23. 			p1=a*x1*x1+b*x1+c;//погрешность при первом корне
  24. 			p2=a*x2*x2+b*x2+c;//погрешности при втором корне
  25. 			printf("Pogrejnost v slu4ai x1     %le\n",p1);
  26. 			printf("Pogrejnost v slu4ai x2     %le\n",p2);
  27. 		}
  28.  
  29. 	}
  30.  
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 2116KB
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stdin
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15
36
-25
stdout
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x1  0.56257
x2  -2.96257
Pogrejnost v slu4ai x1     3.818126e-15
Pogrejnost v slu4ai x2     -6.744605e-15
https://ideone.com/f5qkOK
language:
C (gcc 8.3)
created:
8 years ago
visibility:
secret

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