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