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