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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#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>
int main()
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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
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 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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