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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include<math.h>
  4. #define EPS 1e-6
  5. int main(void) 
  6. {
  7. 	float a,b,c,disc,p,q;
  8.     printf("请输入一元二次方程的系数a,b,c:\n");
  9.     scanf("%f,%f,%f",&a,&b,&c);
  10.     if (fabs(a)<=EPS)
  11.     {
  12.        printf("这不是二次方程\n");
  13.        exit(0);
  14.     }
  15.     disc=b*b-4*a*c;
  16.     p=-b/(2*a);
  17.     q=sqrt(fabs(disc))/(2*a);
  18.     if (fabs(disc)<=EPS)
  19.     {
  20.        printf("x1=x2=%.2f\n",p);
  21.     }
  22.     else
  23.     {
  24.        if (disc>EPS)
  25.        {
  26.           printf("x1=%.2f,x2=%.2f\n",p+q,p-q); 
  27.        }
  28.        else
  29.        {
  30.        printf("x1=%.2f+%.2fi\n",p,q);
  31.        printf("x2=%.2f-%.2fi\n",p,q);
  32.        } 
  33. } 
  34. 	return 0;
  35. }
  36.  
Success #stdin #stdout 0s 5284KB
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1,3,2
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请输入一元二次方程的系数a,b,c:
x1=-1.00,x2=-2.00
https://ideone.com/B0Ud3y
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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