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