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