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