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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#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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}
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#include <stdio.h>
#include <stdlib.h>
#include <math.h>

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#include *  * * * **  * *
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int main()

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