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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Hidden content!
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Hidden content!
#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>
#include <stdlib.h>
#include <math.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
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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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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