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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <math.h>
  4. #define ESP 1e-6
  5. int main(void) {
  6. 	float a,b,c,disc,p,q;
  7. printf("Please enter the cofficients a,b,c:");
  8.     scanf("%f,%f,%f",&a,&b,&c);
  9.     if(fabs(a)<=ESP);{
  10.     printf("It is not a quadratic equation!\n");
  11.     exit(0);
  12. }
  13.     disc=b*b-4*a*c;
  14.     p=-b/(2*a);
  15.     q=sqrt(fabs(disc))/(2*a);
  16.     if(fabs(disc)<=ESP){
  17.     prinyf("x1=x2=%.2f,x2=%.2f\n",p);
  18. }
  19.     else {
  20.       if(disc>ESP){
  21.         printf("x1=%.2f,x2=.2f\n",p+q,p-q);
  22.     }
  23.     else 
  24.     {
  25.       printf("x1=%.2f+%.2fi",p,q);
  26.       printf("x2=%.2f-%.2fi",p,q);
  27.     }
  28.   }
  29. 	return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
1,2,1
stdout 
Please enter the cofficients a,b,c:It is not a quadratic equation!
https://ideone.com/D9CHdy
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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