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>
#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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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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#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
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Case 1: Correct output
Case 2: Wrong output
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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 3: Correct output
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Case 0: Correct output
Case 1: Correct output
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Case 0: Correct output
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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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