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