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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We will continue this question in few days
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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!
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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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#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: Wrong output
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Case 1: Correct output
Case 2: Wrong 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 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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