10-26 Exercise 3: Find roots of a quadratic equation

Question

Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i

Comments

We will continue this question in few days

---

Everything is fixed. Enjoy your time with The Judge :)

---

ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

---

Your code has newline at the end sometime. You learned this lesson many times!

---

After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.

---

your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge

Answer 1

Hidden content!
#include <stdio.h>
  ******  *** *** *  
int main()
{
** * **  *    * * **  *  * *  *  * ****  ***   **** *    
  ****   *     **   *  * **  * *   **** %f *****   *   *  ** ***  *****
* ** * ****  * **   **       * = (b*b-4*a*c);
   *    * ** *** ******  *  * ***  = (-b + sqrt(D))/(2*a);
 *   * *  *  ** * * ***   ** *    = (-b - sqrt(D))/(2*a);
 ****   ****** * * **** *  ****    = -b/(2*a);
*  *** ** *  ** *  *  *   *** * *   =sqrt(-D)/(2*a);
***    *****   * * ** ***** *     **  
     *     ** *****    ***
*     ****     **  * ** ** ***  * * * ****** ** ***  *** *  *     *     of %.2fx^2 + %.2fx + %.2f = 0 are real and  *  *   *     * 
*  **    * *** *****      ** * *******  ***       *  *  * ** *  *   *   = %.2f\nx2 = %.2f",x1,x2);
  ***** **  * *     *    ****  

*** * ***********  **   if(D==0)
**  **    *** * ****** *  ***
*   *  ** *   **** ** * *** *  ***   ** **** * *  ****  **   **  **  **      of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
* **   *** * ** **      ** * ** ***  ****   * *   *  ****  *  * **  *  * = x2 = %.2f",x1);
*  *  *** ** *  **   *   * *  
** * ***** *** * *  ** **  * *
*   * * *   **     * *   *
   **   ******   **  *** *  * * *  ** *   * *********   ** of %.2fx^2 + %.2fx + %.2f = 0 are complex and   * *** ***    ** 
**  ** ** ** **   *   * *  ** *** ***     ** **   **  ****  *      * =    ** * * *  *  * *  *    ***** 
 *  *   **  * * * **  *  * *          * * ***  *  * ** *** = * * *  * **    ** *  * **      *
*       ****   ** * ***  *  
 **  *  ** ** ***    **   *  0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 2

Hidden content!
#include <stdio.h>
  *  *  **  *    ***
int main()
{
**** **      ****  **   * *       *    *   ** * ** ** * **
*  **   **  **  *  *   * **** *   * * ***** %f  ****   *** * **     **  **    ** *
 ** ***   ***** *    **  ** = (b*b-4*a*c);
 * ** **  ****** * *  * *** **** = (-b + sqrt(D))/(2*a);
** *   ** * * * *** *   **  = (-b - sqrt(D))/(2*a);
  *******   ******  *      * ** = -b/(2*a);
*  **   ***        *   *  * * ** * =sqrt(-D)/(2*a);
      * ********   ** **   *   
* ****   *    **  *    **  
  ***  * ** * *    ** * **   ** *  * **** *   ** *  **   **   of %.2f x^2 + %.2f x + %.2f = 0 are real and *   * ***  *    ****** 
    *  ***  ** *  *      *****  * * ** * * **   *****    * = %.2f\nx2 = %.2f",x1,x2);
 **  * * ** * *****  ** *****

** * ***** ** ** * *  ***  *   ** if(D==0)
 **  *  * *    *    *  *     **
** ***      ** * ******     ** ****  *  ***  ** **  * ** *     *  *   of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
   **  *** **    ** **    * *   ***  *   ** *  * **  ***  * *  = x2 = %.2f",x1);
 **  ** * ** ** ***    *   * 
* * *    *     *   **    *  
** ******* ***  ***  *  *  
 **** ***   *** ** ** *  **   * * *  * * ***  *****   * * *  of %.2fx^2 + %.2fx + %.2f = 0 are complex and  *** *      * ***  *
  **** ***    ** **       *       * ***    **       * *  *  * *   ** = **   *  ** ***   ***** *   *
*   *   **** *  * *** *    * ** ** **   *  * ****  * * ** *  ***       *   =   ** * **  *   *  **** *   *   *** ***
   **  **  * ** ****   
 * **   **  *   *  ***   *   0;
}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output

Answer 3

Hidden content!
#include <stdio.h>
#include <stdlib.h>

int main()

{
** *  **   ***  * * *** ** a,b,c,x1,x2,D=0;
 *  *     * *****  *  ***
 *   ***   *    *** ***  * *   *  %f    * * *  ***    *  ****   * * **
  *   *   **  * *  **   *   **
   **** ****  *** *   *** * * **    
* * *   * *  * * * ** **      * *  + sqrt(D))/(2*a);
***  *   ******   * **********  - sqrt(D))/(2*a);
*** * *****     * ** * *   * 
  * * ** * ** * ** ********  *     
  ** **   *  **       **** 
   * ***    ** *** ***   ** **  ** *** ***  * ****   * ***** *** ****  of %.2fx^2+%.2fx+%.2f=0 are complex and  ** **      * ** ****  ***   ****  * 
****   *** *    * *  *** ***  
*      **** ** *  * ***  ***
 * *   **     **** ****   if(D==0)
 * * * ********  **   
*  *       ** *    *  **   *  ***    *   * ** ** *  **  ** * **  * **   of %.2fx^2+%.2fx+%.2f=0 are real and same\nx1=x2=%.2f",a,b,c,x1);
** *** ****  *  *      *** *   * 
* * *** ** **  *** **  **
*  **    ******   * * *    *****
* *** *  **** *** ****  *  *** 
* *** *** **   * *     ** ** ** ***  *     * * *    * **    ***** of %.2fx^2+%.2fx+%.2f=0 are real and  *  ** *  **     *  ** ** * *   *    
 *** **  ***** ** *    * *   *
 *** ** *** **  *** * ***   *  
*  ***  *** ***   *  *   * * 
 * *  *   ** **** * *   * **  0;
}

Comments

prog.c: In function 'main':
prog.c:12:14: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b + sqrt(D))/(2*a);
              ^~~~
prog.c:12:14: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:12:14: note: include '<math.h>' or provide a declaration of 'sqrt'

Answer 4

Hidden content!
* * *** ****** *  
int main()
{
*  *  * ** **   * * *  ** a,b,c,D;
 * *  *** *  *** *******  * x1,x2,r,i;
     ** *   **** **** *  * * * *    ** * *     **   **   ** * * * *
 *  *  * * * *    *** *   * * * **
* * *  **      **  *** *** ******* ****  
*  *  *  *  * *  *  *** *   *** **** * 
*  *  ** ***    * *   **  ***   
  *   *  *** ** ***** *  
***  *  *       **** ** * * * * *     *** ** **       *** *   *  **  of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
 ** * * ***  * ****   ***  ***   *     * * *    * **   *   = x2 = %.2f",x1);
**** *     *   *   * * 
* *     * *     *  * * * * if(D>0)
** **** * ** ***   * * **  
*  * * ** *  ** *****  *  ******  ***          ***  ****  ****     * of %.2fx^2 + %.2fx + %.2f = 0 are complex and *    *    **** * *
**** **   * **  ** * *** *    * *  *  * *** ***   * **   **  = %.2f\n",x1);
** * *****   *** *  *  **  ***  *   * *  *  * *  **  **   * *******  **  * = %.2f",x2);
 **  ******     *** ** *  *   
 **  *   ** ***  ***   *  *  if(D<0)
  * *   **  * * ***  **** ***
****  *  * **  * **  *** *** ** ** ***** * * * ** * * * *****  of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
 *    *  *  **  ******     *   ** *** * **  * ***     -b/(2*a);
*  ***    *** ******     ** **** ** * ***     * *   *    *  **
  *********  ****   * **** * ** * **   * *  ***   *   * **  = %.2f+%.2fi\n",r,i);
*******     *  **** *   * *  *   * * **  ** *  **  *** *  * *  * * = %.2f-%.2fi",r,i);
  *   *  *  * **   *** *   
}

Comments

prog.c: In function 'main':
prog.c:6:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%f%f%f",&a,&b,&c);
     ^~~~~
prog.c:6:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:6:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:12:9: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
         ^~~~~~
prog.c:12:9: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:12:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:17:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:17:9: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:23:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("Roots of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
         ^~~~~~
prog.c:23:9: note: include '<stdio.h>' or provide a declaration of 'printf'

Answer 5

Hidden content!
  * *    *   *  **  * 
int main()
{
 *    *  * **** **  ****** **   a,b,c,D;
       *** * ** * ** *  * *** **  x1,x2,r,i;
 *       * *     * ****** **  **        ***** *    ****   *  **  * * **
*** **  ****** * * *** ** * *****
****** * **   * **  **  *    **  ** *
   *** **   *****  ****** **  *  ** * 
 * **** *******    * ** * * *** 
     * *  * *  ** **    ***
    * *  **  * **    * ***  ** *  * **** *   *  ******** ** **   * * of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
 **      *  *  * * * * **** **   *  *** * * *   *** *  *  * * **  *    *** = x2 = %.2f",x1);
**  *   **    **  ***   *   *
  * **  ** *   *  **   *****  *  * if(D>0)
 ** ** *   * * *** * ****
   *   **  ****  **  *   *  ***   *  * * *     * **  ****** ** **      **  of %.2fx^2 + %.2fx + %.2f = 0 are complex and ** * * * *****   
**   ****    * **** * ****   ***    *  * ** ** *** **  *  *     *  = %.2f\n",x1);
      **   *** ** ***       **  ** **  *      **  * * *    *   = %.2f",x2);
*    *  *  ****  * **  **** 
 **  **  ****** *****  * * **   * if(D<0)
****      * ***  ***  *
 * **     *** ********* **  **     * *       ** **   ** *   **  * * * *  of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
*    *   ***   * * *** ****   ***  ** * *    * *  * * *   -b/(2*a);
* * *   ** * * * * *   *  *   **    *** * **    **  ** ****  * **   
**   **** * ***  *   * ** *  **  * * **** * *  *** *   *  ** *   = %.2f+%.2fi\n",r,i);
  * * ** ***   **      *        *      ****  *    * * ** *** **    ** * = %.2f-%.2fi",r,i);
 *   **** *   ** *  ** ** ** ** 
}

Comments

prog.c: In function 'main':
prog.c:8:12: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1=(-b+sqrt(D))/(2*a);
            ^~~~
prog.c:8:12: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:8:12: note: include '<math.h>' or provide a declaration of 'sqrt'

Answer 6

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
{
 ** ***  * *  * *  **** *  ***    a,b,c,d,x1,x2;
*   *** ** * * * *   * *   *  ** *** * *   ****** ** ** * * **  * *   
**    *   *  *   * ****  * * **  *
* * ** ***  * *    ** ** ** **** 
 *   ******    * **  *  ****   ***    *
* *  ***   **  **  * *** ** *   *  *  * 
 *     ** **  * * **     *  
  **   * **  * *****   *** *** ****  ** * *  * * * * * ** *** **  *   of %.2fx^2 + %.2fx + %.2f = 0 are real and   * ***  * **   **
* ****   * *   * ****     ** * **   ***   ** **  * ***   * ***   **** *  = %.2f\n",x1);
* ****   *  *  ******** *  *** * ***  *   **   * *  * * **** *   *  * = %.2f",x2);
  * ** *   *  ** **   ****
    **  ***   **     **    * * if(d==0)
* *  **  *      * ***  ***** *  *
**  ** *  ***    * ** * ****** ****** ****  *** *  * * **    *  *      of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
    *  * *  *****  * *** ***  * ****  ** * **** ** * ** **  * * *     *  = x2 = %.2f",x1);
****** **  ***  *  * * *  **
 *  ****** * * * *  ***     * *
**  * * *  *** * ** *  **   * * 
  * * ** *  **  * *** * ** *      * **  *  * *  ***    *   ***  of %.2fx^2 + %.2fx + %.2f = 0 are complex and *   **  **    * **
*** * *****  * **  ***  ***  ***    **   *     **     *    **  *  * = *   *****   ****  ** * * 
 ** ****  * * ** * ** * *** *   * * *  * * * * *    *   **** *** ** = * * * * * ***    * * *****  *
*** *  *  *  ** ***   ***  
 **  * *  ****** **** ** * * 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 7

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
** ** * *  *   *    ** *      a,b,c,d,x1,x2;
  * *  * *     * *** ** ** ****  ***  *   * * ****** ** * *****   *    *  *
***  *  *** * * *** **** ***  ** ** * ***
  * ** ***** ***** * **  **  * = (-b + sqrt(d))/(2*a);
  *  *    * ****    * **     * * = (-b - sqrt(d))/(2*a);
*  **       **  ******* **** ** ** *     
*  **  **   *  ***       ***    **  **  *  *  *     *****   ** * of %.2fx^2 + %.2fx + %.2f = 0 are real and different\n",a,b,c);
 * ****   *      ****   *     * ***    ******* *    **   ** **  ** * **  **   *  ***   *  *    * * *** * ****** * ***** *  ***   *  *** *  ***  *  *  **  * ** *    *   * **  *  * * **  *  *****  * **   **** * *  **   = %.2f\n",x1);
 **   **  *** *   ***  * *   * ********* * **  * *****       ** ********  ****  *   *** * ** *   * * *** *  *   *   * *  **  *  *    *       **        * * **** *  ** **** * *      *  ** **       ** *   *  ** * *****  *  = %.2f",x2);}
* *  ** * **  *   * ** * if(d==0)
 ** *  **     *  *  **  ** *  **** * **   ** *    
 **  * *    **     *  *     ** **     ** ** *** ***   ** **  ** **   * ** *    * *  * * *** of %.2fx^2 + %.2fx + %.2f = 0 are real and same\n",a,b,c);
 * **  * *    * *** * ** *** **  ***** *  ** ** **  **    * *** *   *** ** * *** **** ***  ** ** ****   **** *      **  * ****   ** **     * ***   **  ** * = x2 = %.2f",x1);}
**  **  ***  *  * ** * ***  **
 * *** *    ** ***   * *  * *  ********   *  ** * * *  **  * **   ** of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\n",a,b,c);
  *    *  **   ****  **  *  * ** *   *  **  ***  **   *** ** *    * ** =     ** * ** * * ** **** *   
 ****   * *  *  ******  * *  * ** ****  *  *    ***  *    **  ** = *  * **     ***  ****    
 ***    * *****   * **    *  * 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 8

Hidden content!
#include *** *  * * *   
#include     *   * *  

int main()

{
* * ** * ** * *   *** **    **  *  *** *    *   *  *
  *    **     ** *  *  *   *** *   ***  * %f *  ***      *   **  ***** * *   

*      *  ****  *  *    * *  **
**  *     *  *  ** *     * *** + sqrt(D))/(2*a);
*  *     ***     *** * ** ***** **** * -    *  **
*  ****     * * * * **   * *  **  **  * 
*** ****   ***  *   * **     *** *** * *

    *    *** *    *  ** **  (D==0)
   **  *  *** *  * * ***** 
*  * *  *     *  **  ****       * *** *       ** ******* * ***    *   ***** of %.2fx^2 + %.2fx + %.2f = 0 are real and same\nx1 = x2 = ****    **  *** * *
 ** *     *** * **  *** * *  *
****** *** * ***  *     ***   if (D>0)
*  *  * **   ** **** * * 
*  ** *    *********        ***   ** *   * ****** ** * ** * ****    of %.2fx^2 + %.2fx + %.2f = 0 are real and different\nx1 = %.2f\nx2 =  *  *  * *   *** 
**   ******   *   ** * *** 
* *** * * *  **** *  ****** **  *
**  ** * * * *   * **  
** *   *  ** *  * *   **    *   * *    *  * *** **   * *  ** of %.2fx^2 + %.2fx + %.2f = 0 are complex and different\nx1 = %.2f+%.2fi\nx2 =   *  ** ****   *  ******   **
* **  *  ***  *    **  * 

**** ****  *** * **   * * 0;

}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 9

Hidden content!
#include *  **    *** **  * 
#include * ***   *  **** 
int main(void)
{
float a,b,c, D, x1, x2,i;
**** **   ** **  *****  ******  %f   *  ***    &a, &b, &c);
** *** *** *  ** *** *** ***** * 
* * **** ** *    *  ** *     * (D>0)
 *    **  ***  * **** *** **  
   **   *****  ** *   *     * **   ** ** *   **********       ********    **** 
**** * ***      ** **   **  * *   * *****  *      *     ***    ** *  *     *  *

* ****    ** *  ****  *   ** **  ****** *  **  *  *  **   *  *  * ** * *  ** of %.2fx^2 + %.2fx + %.2f = 0 are real and ***  *  = %.2f\nx2 = **  *   **   **   * 
**  **      * ****   * *  
** * *****    * ** * *  **  * if (D==0)
***  ***      *  **  **
**     * ** *   *    *  * **     ** * * *** * * * *  * *******   ****
***     * ****  * ****   *****        * * * **  *  * **  *** *** * of %.2fx^2 + %.2fx + %.2f = 0 are real and same\nx1 = x2 =    * *  *  ** * 
 * **  * *  *  **   *** * 
       *  *  ** *** *  **** ** 
  * * *   **    * ****  **
   *    ** * * ** *  * *   *  *      x1=x2 = -b/(2*a);
 * **  **   *      *  * *  * **** ****** *  ***** * * *  ** 
 *  *** **  ***  *  ** ***  ***   **  * * * *  * * * **   *** *  of %.2fx^2 + %.2fx + %.2f = 0 are complex and * **  * ** = *    ***     = ** *  * * *******   * x2,i);
********* ***  *******    *  ***** 



*** * * **      **  **   *  0;
}

Comments

prog.c: In function 'main':
prog.c:10:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
         x1=(-b+sqrt(D))/(2*a);
                ^~~~
prog.c:10:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:10:16: note: include '<math.h>' or provide a declaration of 'sqrt'

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output

---

prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^

---

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output

Answer 10

Hidden content!
#include  *   **** ** ***   
#include  **      ****

int main()
{
  **  *     **   ***    * ***   a, b, c, *  * * ** x1,x2, realPart, *****  *** 


* ** **   * ** ***** *  **  *  ** *    **** %lf    *  *** *  ****   &b, &c);


   * * ** *   * *      *****    *  = b*b-4*a*c;

   **  ***  *   * ****** * condition for real and different roots


**  **      * **   * **   **    *    for real and equal roots
** *  * **  * * *** ***  *    ** (determinant == 0)
**  **    * *** * *   *
   *   *   * ** *   ** *** ** * **  *** ****  *** * ** *  ** = x2 = -b/(2*a);
 ** ** ** *   *** *         ** **** * *  *    *  *** * * * ****  ***     ***  of %.2fx^2 + %.2fx + %.2f = 0 are real and ***** *   * a,b,c);
*** *** **  * ****    *****    * * *  * *  **   *     ** *      * * * * *  = x2 = *  **   ** x1);
  ****** *****  * ** * *  * **

*  **      *  ****  *  * * ** ** ** if (determinant > 0)
  ***** *** ****  *** ***   **
 *        **  *  ** *  ***   sqrt() function returns square root
* *   ***     ***  ** **   * ** **** *   *   *   * *** ***  = * * ** * *    ** **
    ** *       * *   * ** ***   *  **  **  *  *  ** ****      =  * * ******  *  *   *

 *** ** * *        * *  * *  *  * * *  * *    ** *      **** * ******  ** of %.2fx^2 + %.2fx + %.2f = 0 are real and  * **   *****   *
 * *   ** ***     * *** * * ****   *** *   ******* **** ** ****** **  = *     *    * x1);
      ** **** *******  **   *    **** *   ****  ****  * ****   *  =  ** * * ** x2);
    * ** *  *  * * * ** **  ** if roots are not real
 *   **  *   *  * **** *  
     ****** *******  **  ** 
 *  *****  *     *******   * ** *   * ****  * * ********   * = -b/(2*a);
* * **** ** ***  **    * * * * * *      ** *  ** ****       * =   * ****  *  **
***** * ***** *  *  * *** **  *** *   ****** * **   ***  ***** ** *** **  * of %.2fx^2 + %.2fx + %.2f = 0 are complex and  ***  * **     a,b,c);
**********  ** * ****    ** *       ** *   ** **  ****    **   =   ***   *** *   realPart,   * **  * **
 **   *  * * *  ** * * *  * *****   ** * ***  *   *  *** ** *** * = *  **** *** ** realPart,   * * ***  
      *** *     * ** * *    *

 *   ** * **  *   ** *  ** * 0;
}

Comments

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output