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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56 Answers

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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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Hidden content!
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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>
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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'
commented by (4.3k points)
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Case 0: Correct output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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Case 1: Correct output
Case 2: Wrong output
Case 3: Correct output
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Case 0: Correct output
Case 1: Correct output
Case 2: Wrong 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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