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>
#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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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>
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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
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 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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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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