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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Hidden content!
#include <stdio.h>
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#include <stdio.h>
#include <stdlib.h>

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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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#include     *****    *
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int main(void)
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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: Wrong output
Case 2: Wrong output
Case 3: Wrong output
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Case 1: Correct output
Case 2: Wrong output
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Case 0: Correct output
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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: 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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