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