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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#include <stdio.h>
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Hidden content!
#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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Hidden content!
  **  ** **  *    *
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{
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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>

int main()
{
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}
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#include ****  * ***  *
#include ** *  **** ** 

int main()

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}
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Hidden content!
#include  ** ***   **  * 
#include   ** **  ** 
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'
commented by (4.3k points)
0 0
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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