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

int main()

{
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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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}
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#include    * * *      *
#include  *    * * *     

int main()

{
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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'
commented by (4.3k points)
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Case 0: Correct output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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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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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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