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