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!
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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>
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#include <stdio.h>
#include <stdlib.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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prog.c: In function 'main':
prog.c:21:5: error: expected ';' before '{' token
     {
     ^
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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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