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