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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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
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Case 1: Correct output
Case 2: Wrong output
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Case 0: 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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