10-26 Exercise 3: Find roots of a quadratic equation

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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
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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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.
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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
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#include <stdio.h>
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#include <stdio.h>
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#include <stdio.h>
#include <stdlib.h>

int main()

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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'
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Hidden content!
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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'
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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'
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>

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}
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#include  *** * ** * ***
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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'
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Case 1: Correct output
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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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Case 1: Correct output
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Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
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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;
}
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Case 3: Correct output
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