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

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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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}
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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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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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