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