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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Hidden content!
#include <stdio.h>
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#include <stdio.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>
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#include <stdio.h>
#include <stdlib.h>
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}
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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: Correct output
Case 2: Wrong output
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Case 1: Correct output
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Case 3: 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
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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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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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