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